Install instructions and demo gif

Author: jayphelps

README.md

@@ -1,7 +1,17 @@
 # git-blame-someone-else
 
+## Install
+
+```bash
+$ git clone https://github.com/jayphelps/git-blame-someone-else.git
+$ cd git-blame-someone-else
+$ sudo make install
+```
+
 ## Usage
 
 ```bash
 $ git blame-someone-else <author> <commit>
-```
+```
+
+![ezgif-1396449034](https://cloud.githubusercontent.com/assets/762949/12863650/068e2820-cc2e-11e5-80c5-6ebdb71f51ea.gif)