Update README.md

Added 'How to setup your developer workspace '

README.md

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-#Yakindu Statechart Tools (http://www.statecharts.org)
+#Yakindu Statechart Tools 
+## (http://www.statecharts.org)
+
 The free to use, open source toolkit YAKINDU Statechart Tools (SCT) provides an integrated modeling environment for the specification and development of reactive, event-driven systems based on the concept of statecharts. 
 
+## How to setup your developer workspace 
+  * Download Eclipse Luna from https://www.eclipse.org/downloads/
+  * Install the current Xtext release 
+   * Help / Install new Software / select 'Luna - http://download.eclipse.org/releases/luna'
+   * Select Modeling / Xtext Complete SDK
+  * Select the Git perspective and clone the following Git Repositories:
+   * https://github.com/Yakindu/statecharts.git
+   * https://github.com/Yakindu/base.git
+  * On both repositories, select 'Import projects' on the 'working directory' subfolder
+  * Set the target platform to org.yakindu.base.target/luna.target
+    * Open the target file and click on the link for setting the target platform (takes some minutes the first time)
+  * Build relevant Xtext grammars
+    * Rightclick on org.yakindu.base.expressions/Expressions.xtext => Run As.. => Generate Xtext Artifacts
+    * Rightclick on org.yakindu.sct.stext/SText.xtext => Run As.. => Generate Xtext Artifacts
+    * Rightclick org.yakindu.sct.generator.genmodel/SGen.xtext => Run As.. => Generate Xtext Artifacts
+    * 
+After these steps all projects should compile without errors. To launch a runtime instance which has these projects as installed plugins, just right-click on a project => Run As => Eclipse Application