new CHANGELOG file

CHANGELOG.md

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+# Changelog
+
+All notable changes to the *mORMot Open Source Framework* project will be documented in this file.
+
+## [Unreleased] [2.0.###] - 2020-03-##
+This was the initial release of *mORMot* v2.
+In respect to previous 1.18 revision - from https://github/synopse/mormot:
+### Added
+- No new functionally was introduced, since it was a port of the existing code base.
+### Changed
+- Major source code refactoring into smaller and more refined units.
+### Removed
+- VCL UI units were not converted.
+- Dropped Kylix, Delphi 5-6 support.
+