Create README.md

Author: trantorLiu

README.md

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+# Rendr Example Blog
+This is a RESTfulll blog build with Rendr, MongoDB.  It tries to demonstrates how to use the Rendr library.
+However, it's still very buggy. Any contribution would be appreciate.
+
+## Usage
+```sh
+git clone [email protected]:trantorLiu/rendr-example-blog.git
+cd rendr-example-blog
+npm install
+#development mode
+grunt && node index.js
+#production mode
+grunt server
+```