Make the theme installable through TPM (#4)

* Rename to have .tmux extension so TPM can pick it up
* Create a separate file for TPM & source the theme file
* Update readme with instructions for installation through TPM

README.md

@@ -8,6 +8,7 @@ Theme with 'retro groove' flavor for [Tmux][github-tmux], based on Pavel Pertsev
 
 
 ## Installation
+### Install manually
 The simplest way is just:
 
 > HINT: Always make a backup of your config files before any action.
@@ -16,6 +17,14 @@ The simplest way is just:
 cat tmux-gruvbox-dark.conf >> ~/.tmux.conf
 ```
 
+### Install through [Tmux Plugin Manager](https://github.com/tmux-plugins/tpm)
+Add plugin to the list of TPM plugins in `.tmux.conf`
+```
+set -g @plugin 'egel/tmux-gruvbox'
+```
+Hit `prefix + I` to fetch the plugin and source it.
+Your tmux should be updated with the theme at this point.
+
 ## License
 GPLv3 - Maciej Sypień
 

gruvbox-tpm.tmux

@@ -0,0 +1,4 @@
+#!/usr/bin/env bash
+
+CURRENT_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
+tmux source-file "$CURRENT_DIR/tmux-gruvbox-dark.conf"