Merge pull request #68 from bagigi-arma/docs/how-to-build

Add HEMTT build instructions

Author: jetelain

README.md

@@ -72,3 +72,8 @@ Previous versions from Riouken
 * [withSix](http://play.withsix.com/Arma-3/mods/4KfaixFS4xGnygAVF72WTA)
 * [BI Forum](http://forums.bistudio.com/showthread.php?166488)
 * [GitHub](https://github.com/Riouken/cTab)
+
+How to contribute
+-----------------
+Code contributions are welcome.
+- To build and test modifications of @cTab you can use [HEMTT](https://hemtt.dev/index.html), but currently only version [0.7.6](https://github.com/BrettMayson/HEMTT/releases/tag/v0.7.6) is supported. In the future, the code will be updated to support the tool's latest version.