Add readme

Author: Bruno Sutic

README.md

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 # Tmux Yank
+
+Enables copying to system clipboard in Tmux. Works on Linux and OS X.
+
+Copy mode mappings:
+- `y` - copy selection to system clipboard
+- `C-y` - "put" selection to the command line
+- `M-y` (Alt + y) - performs both of the above: copy to system clipboard and
+  put to command line
+
+### Requirements
+
+#### OS X
+
+- [reattach-to-user-namespace](https://github.com/ChrisJohnsen/tmux-MacOSX-pasteboard)<br/>
+  If you already don't have this installed, then:
+  `$ brew install reattach-to-user-namespace`.
+
+#### Linux
+
+- `xclip` command<br/>
+  You most likely already have `xclip`, but if not install with:
+  - Debian / Ubuntu: `$ sudo apt-get install xclip`
+  - Red hat / CentOS: `$ yum install xclip`
+
+### Installation with [Tmux Plugin Manager](https://github.com/bruno-/tpm) (recommended)
+
+Add plugin to the list of TPM plugins in `.tmux.conf`:
+
+    set -g @tpm_plugins "              \
+      bruno-/tpm                       \
+      bruno-/tmux_yank                 \
+    "
+
+Hit `prefix + I` to fetch the plugin and source it. You should now be able to
+use the plugin.
+
+### Manual Installation
+
+Clone the repo:
+
+    $ git clone https://github.com/bruno-/tmux_yank ~/clone/path
+
+Add this line to the bottom of `.tmux.conf`:
+
+    run-shell ~/clone/path/yank.tmux
+
+Reload TMUX environment:
+
+    # type this in terminal
+    $ tmux source-file ~/.tmux.conf
+
+You should now be able to use the plugin.
+
+### Other Tmux goodies
+
+Tmux yank works well with [tmux copycat](https://github.com/bruno-/tmux_copycat).
+
+### License
+
+[MIT](LICENSE.md)