+ added readme

org.etsi.mts.tdl/README.md

+#TDL Meta-Model (Merged)
+
+##Prerequisites
+
+* All elements shall contain a name
+ * names shown as default in Papyrus may be misleading)
+
+## Updating and merging
+
+* Delete `tdl.uml` (and `org.etsi.mts.tdl`)
+* Copy `tdl_metamodel.uml` to `tdl.uml`
+* Open `tdl.uml` with the UML Editor
+* Select the root package (TDL)
+* Select the Merge command from the menu (UML Editor -> Package -> Merge)
+* Use the default properties in the dialog 
+* Open `tdl.genmodel`
+* Select Reload in the menu (Generator -> Reload...)
+
+## Generating
+
+* Open `tdl.genmodel`
+* Select `Tdl` package from the root 
+* In the properties view set `Prefix` to `tdl` and `Base Package` to `org.etsi.mts`
+* Save
+* Right-click on the `tdl` package and select Generate Model Code
+
+## Exporting XMI schema
+
+* Right-click on the `tdl.genmodel` and select Export Model...
+* Select "XML Schema for XMI" in the dialog, press "Next" two times
+* Select both packages (`tdl` and `types`) and press "Finish"
+* The TDL schema is generated in the `tdlXMI.xsd` file
+