Added a rudimentary CHANGELOG.md with summary for 0.2.0

CHANGELOG.md

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+# Changelog
+All notable changes to this project will be documented (for humans) in this file.
+
+The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
+and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
+
+## [0.2.0] - 2020-02-04
+
+Improvements to `ls` and `upload` commands
+
+### Added
+- `ls`: include a list (with counts) of neural datatypes in the file
+- `upload`:
+  - ability to reupload files (by removing already existing ones)
+  - ability to "sync" (skip if not modified) to girder based on mtime
+    and size
+- CI (github actions): testing on macos-latest
+### Changed
+- removed `hdmf !=` statement in setup.cfg to not confuse pypi.
+### Fixed
+- `upload` - assure string for an error message
+- mitigated crashes in pynwb if neural data type schema is not cached
+  in the file and requires import of the extension module.  ATM the
+  known/handled only the `AIBS_ecephys` from `allensdk`
+
+
+## [Unreleased]
+
+TODO Summary
+
+### Added
+### Changed
+### Fixed
+### Removed
+### Security
+
+
+[0.2.0]: https://github.com/dandi/dandi-cli/commits/0.2.0