Create CHANGELOG.md

Author: oclyke

docs/CHANGELOG.md

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+Arduino Apollo3 Core Changelog
+==============================
+
+This is a record of the major changes between versions of the SparkFun Arduino Apollo3 core. Only major changes will be recorded for convenience. The complete detail of changes is found in the commit history of this repo.
+
+Each log entry will use the version number of the release that contains the changes listed. Newest version at the top of the file (just below this line)
+
+0.0.1
+=====
+- Add SparkFun Variable Bootloader
+- Better support for malloc + related functions
+
+
+0.0.0
+=====
+Initial release