add readme

Author: lgessler

README.md

@@ -1,2 +1,8 @@
 # RS4Module 
-Todo
+
+This module is used to construct RST++ structures (signals and secondary edges).
+It depends upon annotations created by the [RST importer module](https://github.com/korpling/pepperModules-RSTModules)
+and should be run AFTER the merging manipulator has been run, if it is being used.
+
+# Changelog
+* 0.1.0 - Initial Release