Add brief project description in README (#13)

README.md

@@ -3,6 +3,7 @@
 [![Build Status](https://travis-ci.org/imcatta/ros_mapek_framework.svg?branch=master)](https://travis-ci.org/imcatta/ros_mapek_framework)
 [![Documentation Status](https://readthedocs.org/projects/ros-mape-k-framework/badge/?version=latest)](https://ros-mape-k-framework.readthedocs.io/en/latest/?badge=latest)
 
+A simple framework that help developers build [ROS](http://ros.org) applications based on the MAPE-K pattern. Full documentation is avalable at [ros-mape-k-framework.readthedocs.io](https://ros-mape-k-framework.readthedocs.io).
 
 ### How to install
 0. [Install ROS](http://wiki.ros.org/melodic/Installation). The full version is required. 
@@ -29,5 +30,3 @@ source devel/setup.bash
 roslaunch mapek_framework_demo demo.launch
 ```
 3. (Optional) Inspect nodes using `rqt_graph` and `rosrun rqt_console rqt_console`.
-![Screenshot](docs/images/rqt_graph_screenshot.png)
-![Screenshot](docs/images/rqt_console_screenshot.png)