[TASK][DOC] (master): add CHANGELOG file

CHANGELOG

+this is <CHANGELOG>
+============================================================================
+Recent development in Seitosh (bug fixes, new features, etc)
+------------------------------------------------------------
+
+----- END OF CHANGELOG ----- 

README.md

@@ -35,3 +35,8 @@ repository. Not all of the accompanying documentation and
 installations instructions have yet been copied from there.
 See [README.history](README.history) for the history of 
 this project.
+
+News
+----
+Recent development (bug fixes, new features, etc) is reported in
+[CHANGELOG](CHANGELOG).