Add a changelog for EPP

Fixes #55

CHANGELOG.md

@@ -0,0 +1,19 @@
+# Eclipse Packaging Project Change Log
+
+The Eclipse Packaging Project (EPP) assembles the contents of the quarterly Eclipse Simulatanous Release (SimRel) into products that can be downloaded from the [Eclipse IDE website](https://eclipseide.org).
+This document aims to highlight configuration and content changes of the packages provided by EPP in each quarterly release.
+For changes in Eclipse projects that contribute to SimRel and are included in the EPP packages, refer to the change log or New and Noteworthy document of the particpating projects.
+The [Eclipse IDE New & Noteworthy](https://eclipseide.org/release/noteworthy/) page combines all those documents in one place.
+
+## 2023-09
+
+- With the new Mylyn major version being released the list of features included in packages have been updated to their new names and IDs.
+
+## 2023-06
+
+- With [Eclips Mylyn](https://eclipse.dev/mylyn/)'s return to the SimRel train Mylyn features have also been added back to all the EPPs, except Eclipse IDE for Java and DSL Developers.
+
+## Prior to 2023-06
+
+This Changelog was introduced for release 2023-09 and backfilled to 2023-06.
+If you require additional information about older versions to be added to this changelog, please [raise an issue](https://github.com/eclipse-packaging/packages/issues).