Add installation instructions to the readme

Author: Bruno Sutic

CHANGELOG.md

@@ -6,6 +6,7 @@
 - add links to related plugins to the readme
 - add screencast script to the repo
 - add screencast video link to the README
+- add installation instructions
 
 ### v0.0.2, Aug 02, 2014
 - add readme

README.md

@@ -25,6 +25,35 @@ In copy mode:
 
 [![screencast screenshot](/video/screencast_img.png)](http://vimeo.com/102455265)
 
+### Installation with [Tmux Plugin Manager](https://github.com/tmux-plugins/tpm) (recommended)
+
+Add plugin to the list of TPM plugins in `.tmux.conf`:
+
+    set -g @tpm_plugins "          \
+      tmux-plugins/tpm             \
+      tmux-plugins/tmux-open       \
+    "
+
+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/tmux-plugins/tmux-open ~/clone/path
+
+Add this line to the bottom of `.tmux.conf`:
+
+    run-shell ~/clone/path/open.tmux
+
+Reload TMUX environment:
+
+    # type this in terminal
+    $ tmux source-file ~/.tmux.conf
+
+You should now be able to use the plugin.
+
 ### Other goodies
 
 `tmux-open` works great with: