Add project changelog file.

CHANGELOG.md

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+# Change Log
+
+All notable changes to the PHP Solid Server will be documented in this file.
+
+This project adheres to the [Keep-a-changelog](http://keepachangelog.com/) and
+[Semantic Versioning](http://semver.org/) conventions.
+
+<!--
+## [Unreleased][unreleased]
+### Added
+### Changed
+### Deprecated
+### Removed
+### Fixed
+### Security
+-->
+
+## [v0.0.0](https://github.com/pdsinterop/solid-server-php/tree/v0.0.0) (2020-06-12)
+
+\* *This Change Log was automatically generated by [github_changelog_generator](https://github.com/skywinder/Github-Changelog-Generator)*