Added support for C# using OmniSharp

contrib/lang/csharp/README.md

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+# C# contribution layer for Spacemacs
+
+![logo](img/csharp.png)
+
+<!-- markdown-toc start - Don't edit this section. Run M-x markdown-toc/generate-toc again -->
+**Table of Contents**
+
+- [C# contribution layer for Spacemacs](#c-contribution-layer-for-spacemacs)
+    - [Description](#description)
+    - [Packages Included](#packages-included)
+    - [Install](#install)
+    - [Key Bindings](#key-bindings)
+        - [Tests](#tests)
+        - [Navigation](#navigation)
+        - [Type information](#type-information)
+        - [Refactoring](#refactoring)
+        - [Solution/Project manipulation](#solutionproject-manipulation)
+        - [Compilation](#compilation)
+        - [Code manipulation](#code-manipulation)
+        - [OmniSharp server interaction](#omnisharp-server-interaction)
+
+<!-- markdown-toc end -->
+
+## Description
+
+This layer adds experimental support for C# language using [OmniSharp](https://github.com/OmniSharp/omnisharp-emacs).
+The layer requires the OmniSharp server, refer to the install section.
+
+## Packages Included
+
+- [OmniSharp-emacs](https://github.com/OmniSharp/omnisharp-emacs)
+- [OmniSharp-server](https://github.com/OmniSharp/omnisharp-server)
+
+## Install
+
+To use this contribution add it to your `~/.spacemacs`
+
+```elisp
+(setq-default dotspacemacs-configuration-layers '(csharp)
+  "List of contribution to load."
+)
+```
+
+- Compile the OmniSharp server, following the instructions found here: https://github.com/OmniSharp/omnisharp-server
+
+- Then do one of:
+
+    a) In `.spacemacs` add the path to OmniSharp to an Emacs variable `(setq omnisharp-server-executable-path "/PATH/TO/OMNISHARP/OmniSharpServer")`
+
+    b) Ensure that the binary `OmniSharp` is available in Emacs' `exec-path`.
+
+OmniSharp should now automatically load and start a server when you open a `.cs` file.
+
+## Limitations
+It's currently not possible to create C# solutions outside of IDEs such as MonoDevelop,
+it's therefore recommended that you install a C# IDE and use that for creating a solution.
+
+Debugging is possible using [SDB](https://github.com/mono/sdb), or by using an IDE.
+
+## Key Bindings
+
+### Tests
+
+    Key Binding       |                 Description
+----------------------|------------------------------------------------------------
+                "mta" | Run all tests in project
+                "mtb" | Run all tests in current file/fixture
+                "mtt" | Run test under cursor
+
+### Navigation
+
+    Key Binding       |                 Description
+----------------------|------------------------------------------------------------
+                "mgg" |   Go to definition
+                "mgG" |   Go to definition in other window
+                "mgu" |   Find usages of symbol under cursor using Helm
+                "mgs" |   Find symbols using Helm
+                "mgi" |   Find implementations
+                "mgr" |   Go to region
+                "mgm" |   Go to solution member
+                "mgM" |   Go to solution member in other window
+                "mgf" |   Go to solution file
+                "mgF" |   Go to solution file then member
+
+### Type information
+
+    Key Binding       |                 Description
+----------------------|------------------------------------------------------------
+                 "mt" | Get type information for symbol under cursor
+                 "mT" | Get type information for symbol under cursor and put it into kill-ring
+
+### Refactoring
+
+    Key Binding       |                 Description
+----------------------|------------------------------------------------------------
+                "mrm" | Rename symbol under cursor
+                "mrr" | Refactor symbol under cursor
+
+### Solution/Project manipulation
+
+    Key Binding       |                 Description
+----------------------|------------------------------------------------------------
+                "mpa" | Add the current file to solution
+                "mpA" | Add files selected in dired to solution
+                "mpr" | Remove the current file from solution
+                "mpR" | Removed files selected in dired from solution
+                "mpl" | Add reference to solution
+
+### Compilation
+
+    Key Binding       |                 Description
+----------------------|------------------------------------------------------------
+                 "mb" | Build the solution
+
+### Code manipulation
+
+    Key Binding       |                 Description
+----------------------|------------------------------------------------------------
+                 "mo" | Auto complete overrides
+                 "mi" | Fix usings/imports
+                 "m=" | Format the current buffer
+
+### OmniSharp server interaction
+
+    Key Binding       |                 Description
+----------------------|------------------------------------------------------------
+                "mss" | Start the OmniSharp server
+                "msS" | Stop the OmniSharp server
+                "msr" | Reload the solution

contrib/lang/csharp/extensions.el

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+;;; extensions.el --- csharp Layer extensions File for Spacemacs
+;;
+;; Copyright (c) 2012-2014 Sylvain Benner
+;; Copyright (c) 2014-2015 Sylvain Benner & Contributors
+;;
+;; Author: Sylvain Benner <sylvain.benner@gmail.com>
+;; URL: https://github.com/syl20bnr/spacemacs
+;;
+;; This file is not part of GNU Emacs.
+;;
+;;; License: GPLv3
+
+(defvar csharp-pre-extensions
+  '(
+    ;; pre extension csharps go here
+    )
+  "List of all extensions to load before the packages.")
+
+(defvar csharp-post-extensions
+  '(
+    ;; post extension csharps go here
+    )
+  "List of all extensions to load after the packages.")
+
+;; For each extension, define a function csharp/init-<extension-csharp>
+;;
+;; (defun csharp/init-my-extension ()
+;;   "Initialize my extension"
+;;   )
+;;
+;; Often the body of an initialize function uses `use-package'
+;; For more info on `use-package', see readme:
+;; https://github.com/jwiegley/use-package

contrib/lang/csharp/packages.el

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+;;; packages.el --- csharp Layer packages File for Spacemacs
+;;
+;; Copyright (c) 2012-2014 Sylvain Benner
+;; Copyright (c) 2014-2015 Sylvain Benner & Contributors
+;;
+;; Author: Sylvain Benner <sylvain.benner@gmail.com>
+;; URL: https://github.com/syl20bnr/spacemacs
+;;
+;; This file is not part of GNU Emacs.
+;;
+;;; License: GPLv3
+
+(defvar csharp-packages
+  '(omnisharp))
+
+(defvar csharp-excluded-packages '()
+  "List of packages to exclude.")
+
+(defun csharp/init-omnisharp ()
+  ;; Load omnisharp-mode with csharp-mode, this should start the omnisharp server automatically
+  (add-hook 'csharp-mode-hook 'omnisharp-mode)
+  (use-package omnisharp
+    :defer t
+    :config  (evil-leader/set-key-for-mode 'csharp-mode
+              ;; Tests
+              "mta" 'omnisharp-unit-test-all
+              "mtb" 'omnisharp-unit-test-fixture
+              "mtt" 'omnisharp-unit-test-single
+
+              ;; Navigation
+              "mgg"   'omnisharp-go-to-definition
+              "mgG"   'omnisharp-go-to-definition-other-window
+              "mgu"   'omnisharp-helm-find-usages
+              "mgs"   'omnisharp-helm-find-symbols
+              "mgi"   'omnisharp-find-implementations
+              "mgr"   'omnisharp-navigate-to-region
+              "mgm"   'omnisharp-navigate-to-solution-member
+              "mgM"   'omnisharp-navigate-to-solution-member-other-window
+              "mgf"   'omnisharp-navigate-to-solution-file
+              "mgF"   'omnisharp-navigate-to-solution-file-then-file-member
+
+              ;; Type info
+              "mt" 'omnisharp-current-type-information
+              "mT" 'omnisharp-current-type-information-to-kill-ring
+
+              ;; Refactoring
+              "mrm" 'omnisharp-rename
+              "mrr" 'omnisharp-run-code-action-refactoring
+
+              ;; Solution/project manipulation
+              "mpa" 'omnisharp-add-to-solution-current-file
+              "mpA" 'omnisharp-add-to-solution-dired-selected-files
+              "mpr" 'omnisharp-remove-from-project-current-file
+              "mpR" 'omnisharp-remove-from-project-dired-selected-files
+              "mpl" 'omnisharp-add-reference
+
+              ;; Compile
+              "mb" 'omnisharp-build-in-emacs ;; Only one compile command so use top-level
+
+              ;; Code manipulation
+              "mo" 'omnisharp-auto-complete-overrides
+              "mi" 'omnisharp-fix-usings
+              "m=" 'omnisharp-code-format
+
+              ;; Server manipulation, inspired spacemacs REPL bindings since C# does not provice a REPL
+              "mss" 'omnisharp-start-omnisharp-server
+              "msS" 'omnisharp-stop-server
+              "msr" 'omnisharp-reload-solution)
+
+    ;; Init omnisharp company backend
+    (eval-after-load 'company
+      '(add-to-list 'company-backends 'company-omnisharp))
+    ))