Update README.md

Author: mfbx9da4

README.md

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+Downloads git sub dir
+
+##Usage
+      
+
+    python get_git_sub_dir.py path/to/sub/dir <RECURSIVE>
+    
+<RECURSIVE> is a boolen `True` or `False`. Default is `True`.
+
+
+##Example
+
+Lets download the docs from twitter bootstrap https://github.com/twbs/bootstrap/tree/master/docs
+
+    python get_git_sub_dir.py twbs/bootstrap/docs
+
+If we don't want it to be recursive
+
+    python get_git_sub_dir.py twbs/bootstrap/docs False