[GR-10355] Add changelog

PullRequest: graalpython/72

Author: timfel

CHANGELOG.md

@@ -0,0 +1,16 @@
+# Python Changelog
+
+This changelog summarizes major changes between GraalVM versions of the Python
+language runtime. The main focus is on user-observable behavior of the engine.
+
+## Version 1.0.0 RC2
+
+* Updates to the polyglot and embedding APIs
+* Many additions to the language core implementation
+* Performance improvements to the parser
+* C-API improvements to compile and run simple C extensions
+* Support breakpoints on caught and uncaught exceptions in debugger
+
+## Version 1.0.0 RC1
+
+* LICENSE set to The Universal Permissive License (UPL), Version 1.0.