+added readme instructions for the TDL to TTCN-3 mapping

*adjusted readme formatting

Change-Id: I5ee6e2be8ef047ad3d9f91785642c8f40bcf357e
Signed-off-by: makedonski <makedonski@informatik.uni-goettingen.de>

Readme.md

@@ -46,18 +46,25 @@ More information on using the plugins is available at [Usage wiki](https://tdl.e
 
  * Download and install Eclipse Modeling Tools package
  * Install following additional components from Eclipse Marketplace
-  * Sirius
-  * Eclipse Xtext
-  * Epsilon
-  * Eclipse OCL
+     * Sirius
+     * Eclipse Xtext
+     * Epsilon
+     * Eclipse OCL
  * Check out the repository
  * Import the plug-ins in the Eclipse workspace
  * Generate the meta-model code
-  * Open the `tdl.genmodel` 
-  * Right click on the top-node and generate model code 
+     * Open the `tdl.genmodel` 
+     * Right click on the top-node and generate model code 
  * Generate textual editor code
-  * Open the `GenerateTDLan2.mwe`
-  * Right click and select Run As -> MWE2 Workflow
-  * Additionally (or alternatively) repeat the same steps for the `GenerateTPLan2.mwe` (for editing structured test objectives)
-  * Additionally (or alternatively) repeat the same steps for the `GenerateData.mwe` (for the graphical viewer)
+     * Open the `GenerateTDLan2.mwe`
+     * Right click and select Run As -> MWE2 Workflow
+     * Additionally (or alternatively) repeat the same steps for the `GenerateTPLan2.mwe` (for editing structured test objectives)
+     * Additionally (or alternatively) repeat the same steps for the `GenerateData.mwe` (for the graphical viewer)
 
+## Implementation of the TDL mapping to TTCN-3
+
+The TDL mapping to TTCN-3 relies on some functionalities from [TRex2 / T3Tools](https://t3tools.informatik.uni-goettingen.de/trac). Before installing or developing the implementation of the TDL mapping to TTCN-3, the corresponding components need to be installed from the following update site:
+
+    https://t3tools.informatik.uni-goettingen.de/downloads/trex2/
+
+After installation, to apply the transformation of a TDL model into TTCN-3 code, open the TDL model (making sure it is selected) and press the `T3` icon on the toolbar. This shall result in the generation of a `.ttcn3` file with the same name in the same folder as the model.
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