Update README.md
Add the building details.
@@ -119,6 +119,12 @@ Latest API Docs is <a target="_blank" href="https://siddhi-io.github.io/siddhi/a
* Report issues at <a target="_blank" href="https://github.com/wso2/siddhi/issues">GitHub Issue Tracker</a>.
* Feel free to try out the <a target="_blank" href="https://github.com/wso2/siddhi">Siddhi source code</a> and send your contributions as pull requests to the <a target="_blank" href="https://github.com/wso2/siddhi/tree/master">master branch</a>.
+## Build from the source
+
+- Get a clone or download source from [Github](https://github.com/siddhi-io/siddhi.git)
+- Prerequisites: Maven 3.5.x version (Install [Maven](https://maven.apache.org/install.html))
+- Run the Maven command ``mvn clean install`` from the root directory
+
## Contact us
* Post your questions with the <a target="_blank" href="http://stackoverflow.com/search?q=siddhi">"Siddhi"</a> tag in <a target="_blank" href="http://stackoverflow.com/search?q=siddhi">Stackoverflow</a>.
* For more details and support contact us via <a target="_blank" href="http://wso2.com/support?utm_source=gitanalytics&utm_campaign=gitanalytics_Jul17">http://wso2.com/support/</a>
