Update CONTRIBUTING.md

Author: codereport

CONTRIBUTING.md

@@ -45,4 +45,8 @@
    # this one requires to uncomment the disabled tests in ./test/CMakeLists.txt
    cd ./build && /usr/bin/ctest --force-new-ctest-process -C Debug -R disabled_ && cd ..
    ```
-   
+
+Extra: Get JHS Web IDE
+```
+./build/jsrc/Debug/jconsole ./jlibrary/addons/ide/jhs/config/jhs.cfg
+```