Add a ChangeLog

The keep-a-changelog format seems nice, let's try it.

Author: derfian

CHANGELOG.md

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+# Change log
+
+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
+
+- `thinlinc_agent_hostname`, a variable that allows you to customize
+  /vsmagent/agent_hostname parameter on ThinLinc Agent servers.
+
+## [1.0] - 2018-11-22
+
+First release.
+
+### Added
+
+- An Ansible role to install the ThinLinc server software.
+
+[unreleased]: https://github.com/cendio/ansible-role-thinlinc-server/compare/v1.0...HEAD
+[1.0]: https://github.com/cendio/ansible-role-thinlinc-server/compare/...v1.0