add doc. add link to roxma/nvim-completion-manager#14

README.md

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+
+# vim-hug-neovim-rpc
+
+This is an experimental project. I started this project because I want to fix
+the [vim8 support](https://github.com/roxma/nvim-completion-manager/issues/14)
+issue for
+[nvim-completion-manager](https://github.com/roxma/nvim-completion-manager).
+
+Since this is a general perpurse module, other plugins needing rpc support may
+benefits from this project. However, there're many neovim rpc methods I havn't
+implemented yet, which make this an experimental plugin. Please fork and open
+a PR if you get ideas on improvement.
+
+![screencast](https://cloud.githubusercontent.com/assets/4538941/23102626/9e1bd928-f6e7-11e6-8fa2-2776f70819d9.gif)
+
+