Update readme

Author: aperezlebel

README.md

@@ -7,10 +7,15 @@
 
 ## Install
 
+From PyPi:
 ```
-pip install git+https://github.com/aperezlebel/glest.git
+pip install glest
 ```
 
+From source:
+```
+pip install git+https://github.com/aperezlebel/glest.git
+```
 
 ## Cite