add composer.json

composer.json

+{
+    "name": "twitter/bootstrap"
+  , "description": "Sleek, intuitive, and powerful front-end framework for faster and easier web development."
+  , "keywords": ["bootstrap", "css"]
+  , "homepage": "http://twitter.github.com/bootstrap/"
+  , "author": "Twitter Inc."
+  , "license": "Apache-2.0"
+  , "target-dir": "twitter/bootstrap"
+
+}