Added installation instructions without npm.

Author: qw3rtman

README.md

@@ -34,8 +34,25 @@ Looking good!
 ```sh
 	$ npm install -g gg
 ```
+
+If that doesn't work, try running it as root. `$ sudo npm install -g gg`
+
 You can also get up and running without npm, but it is not recommended to do so.
 
+```sh
+	# Clone the repository.
+	$ git clone https://github.com/qw3rtman/gg.git
+	
+	# Switch into the repository's directory.
+	$ cd gg
+	
+	# Install!
+	$ npm install -g
+	
+	# Install as root, if the above command does not work.
+	$ sudo npm install -g
+```
+
 `gg` relies on Node.js and `git`.
 
 ## Usage