Add list of plugins

PLUGINS.md

@@ -0,0 +1,11 @@
+# Tmux plugins list
+
+If you create a plugin, feel free to create a pull request that adds it to the
+list.
+
+- [tmux_pain_control](https://github.com/bruno-/tmux_pain_control) - standard
+  bindings for controlling panes.
+- [goto_session](https://github.com/bruno-/tmux_goto_session) - faster session
+  switching.
+- [battery_osx](https://github.com/bruno-/tmux_battery_osx) - battery status
+  for OSX in tmux `status-right`

README.md

@@ -59,6 +59,11 @@ After you press `prefix + I`, everything should be up to date.
 
 ### List of plugins
 
+[List of plugins](PLUGINS.md).
+
+If you create a plugin, feel free to create a pull request that adds it to the
+list.
+
 ### Creating plugins
 
 ### License