Update README.md

Author: Ravi Prakash Joshi

README.md

@@ -1,2 +1,19 @@
 # ros_protocol_buffer_tutorial
 Protocol Buffer tutorial for ROS
+
+[Protocol Buffers](https://developers.google.com/protocol-buffers/) are Google's language-neutral and platform-neutral extensible mechanism for serializing structured data.
+
+## Installation
+1. Download the repository or use `git clone` appropriately.
+1. Make sure to have a working ros workspace. Place the downloaded code inside source folder i.e., `src` of ros workspace.
+1. Setup protobuf. Kindly see [here](lib/README.md.md).
+
+## Compilation
+1. Invoke catkin tool inside ros workspace i.e., `catkin_make`
+
+## Steps to run
+1. Invoke the publisher by using following command `rosrun ros_protocol_buffer_tutorial main`
+1. The published data can be seen by using following coomand `rostopic echo protobuff_address_book`
+
+## Note
+1. The application is tested on ROS Indigo in 64Bit Ubuntu 14.04.5 LTS, 8GB RAM, Intel Core i7-2600 3.40GHz x 8 CPU with kernel 4.4.0-59-generic and gcc 4.8.4.