Add CHANGELOG (#5)

Add CHANGELOG.md.
Closes #5.

Author: DifferentialOrange

CHANGELOG.md

@@ -0,0 +1,21 @@
+# 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).
+
+## [Unreleased]
+### Added
+- Publish dashboard on Grafana official and community built dashboards
+
+### Changed
+- Update metrics version to 0.3.0 in experimental cluster
+- Rework example Tarantool instance on "cartridge.roles.metrics"
+- Documentation improvements and fixes
+
+## [0.1.0] - 2020-06-30
+### Added
+- Ready for import InfluxDB dashboard: HTTP panels, memory panels, space operations panels
+- Experimental docker cluster: Tarantool + Telegraf + InfluxDB + Grafana, Tarantool + Prometheus + Grafana
+- Simple test on InfluxDB dashboard
+- Build environment and documentation