Create a CHANGELOG

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).
+
+## 1.0.0 (Unreleased)
+
+This release is the first major release and includes an upgrade to TeamCity 2019.2.2 as the supported version.
+Whenever a major version is bumped, backwards compatibility with previous TeamCity versions aren't guaranteed.
+
+### Features:
+- **New resource**: Support for TeamCity User Group [#69]
+
+### Fixes:
+- Resolved [#43] Migrated _step_ attribute for Build Config to `schema.TypeList` [#70]
+
+### Maintenance:
+- Upgrade client library to `v1.0.0` and TeamCity in tests to 2019.2.2 [#71]
+- Migrate to `terraform-plugin-sdk` instead of Terraform Core [#72]
+
+[//]: # (Release links)
+[1.0.0]: https://github.com/cvbarros/terraform-provider-teamcity/releases/tag/v1.0.0
+
+[//]: # (Issue/PR links)
+[#43]: https://github.com/cvbarros/terraform-provider-teamcity/issues/43
+[#69]: https://github.com/cvbarros/terraform-provider-teamcity/pull/69
+[#70]: https://github.com/cvbarros/terraform-provider-teamcity/pull/70
+[#71]: https://github.com/cvbarros/terraform-provider-teamcity/pull/71
+[#72]: https://github.com/cvbarros/terraform-provider-teamcity/pull/72