add README

README.md

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+# My config of Neovim
+
+Here is my config of neovim.
+
+## Usage
+
+just clone this repository into directory `~/.config/nvim/`, note you need install vim-plug in advance.
+
+Install [vim-plug](https://github.com/junegunn/vim-plug) first
+
+```
+# line below is from vim-plug's README
+sh -c 'curl -fLo "${XDG_DATA_HOME:-$HOME/.local/share}"/nvim/site/autoload/plug.vim --create-dirs \
+       https://raw.githubusercontent.com/junegunn/vim-plug/master/plug.vim'
+```
+
+Clone this repository into directory `~/.config/nvim` or other location under XDG's config directory.
+
+```
+git clone git@github.com/leafee98.com/config-neovim.git ~/.config/nvim
+```