Added changelog.md

Author: adrianprelipcean

changelog.md

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+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/), and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [1.0.2](https://github.com/adrianprelipcean/express-rate-limit-postgresql/releases/tag/v1.0.2)
+
+### Added
+
+- First release with core functionality according to [express-rate-limit guide](https://github.com/express-rate-limit/express-rate-limit/wiki/Creating-Your-Own-Store)