Add task plugin

plugins/task-plugin/.gitignore

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+dist/
+lib/
+node_modules/
+*.theia

plugins/task-plugin/README.md

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+# Theia - Che Task Plug-in
+
+The plugin allows to work with the Che Commands through the Theia Tasks concept.
+
+Contributes:
+- Che task runner that runs the Che commands as the Theia tasks;
+- Che task resolver that fills the missed mandatory parameters in a task;
+- Che task provider that provides the Che workspace's commands as provided Theia tasks;
+- `Preview URLs` view;
+- `che.task.preview.notifications` preference to set the preferred way of previewing a service URL:
+  - `on` value enables a notification to ask a user how a URL should be opened
+  - `alwaysPreview` value tells Theia to open a preview URL automatically inside Theia as soon as a task is running
+  - `alwaysGoTo` value tells Theia to open a preview URL automatically in a separate browser's tab as soon as a task is running
+  - `off` value disables opening a preview URL (automatically and with a notification)
+
+The format of a Che task is the following:
+```json
+{
+    "type": "che",
+    "label": "",
+    "command": "",
+    "target": {
+        "workspaceId": "",
+        "machineName": ""
+    },
+    "previewUrl": ""
+}
+```
+The `target` and `previewUrl` fields are optional.
+
+The variables substitution is supported for the `command` and `previewUrl` fields.

plugins/task-plugin/package.json

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+{
+  "name": "task-plugin",
+  "publisher": "theia",
+  "keywords": [
+    "theia-plugin"
+  ],
+  "version": "0.0.1",
+  "license": "EPL-2.0",
+  "contributors": [
+    {
+      "name": "Artem Zatsarynnyi",
+      "email": "azatsary@redhat.com"
+    },
+    {
+      "name": "Roman Nikitenko",
+      "email": "rnikiten@redhat.com"
+    }
+  ],
+  "files": [
+    "src"
+  ],
+  "contributes": {
+    "configuration": {
+      "type": "object",
+      "title": "Che task preview configuration",
+      "properties": {
+        "che.task.preview.notifications": {
+          "type": "string",
+          "default": "on",
+          "enum": [
+            "on",
+            "alwaysPreview",
+            "alwaysGoTo",
+            "off"
+          ],
+          "description": "Enable/disable the notifications with a proposal to open a Che task's preview URL. Can be: 'on', 'alwaysPreview', 'alwaysGoTo' or 'off'."
+        }
+      }
+    }
+  },
+  "devDependencies": {
+    "@eclipse-che/plugin": "0.0.1",
+    "@theia/plugin": "next",
+    "@theia/plugin-packager": "latest"
+  },
+  "scripts": {
+    "prepare": "yarn run clean && yarn run build",
+    "clean": "rimraf lib",
+    "format": "tsfmt -r --useTsfmt ../../configs/tsfmt.json",
+    "watch": "tsc -watch",
+    "compile": "tsc",
+    "lint": "tslint -c ../../configs/tslint.json --project tsconfig.json",
+    "lint:fix": "tslint -c ../../configs/tslint.json --fix --project .",
+    "build": "concurrently -n \"format,lint,compile\" -c \"red,green,blue\" \"yarn format\" \"yarn lint\" \"yarn compile\" && theia:plugin pack"
+  },
+  "engines": {
+    "theiaPlugin": "next"
+  },
+  "theiaPlugin": {
+    "backend": "lib/task-plugin-backend.js"
+  }
+}