Update README.md

README.md

@@ -7,6 +7,22 @@ Copyright 2015 Google Inc.
 
 See grpc/INSTALL for installation instructions for various platforms.
 
+#Repository Structure
+
+This repository contains source code for gRPC libraries for multiple lanugages.
+
+   * C source code: [src/core] (src/core)
+   * C++ source code: [src/cpp] (src/cpp)
+   * Python source code: [src/python] (src/python)
+   * Python source code: [src/ruby] (src/ruby)
+   * Ruby source code: [src/node] (src/node)
+   * PHP source code: [src/php] (src/php)
+   * Python source code: [src/csharp] (src/csharp)
+   
+Java source code is in [grpc-java] (http://github.com/grpc/grpc-java) repository. 
+Go source code is in [grpc-go] (http://github.com/grpc/grpc-go) repository.
+
+
 #Overview