add changelog (#11)

Author: kopiczko

CHANGELOG.md

@@ -0,0 +1,10 @@
+# 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]
+
+[Unreleased]: https://github.com/giantswarm/REPOSITORY_NAME/tree/master

README.md

@@ -1,6 +1,24 @@
+<!--
+
+    TODO:
+
+    - Add the project to the CircleCI:
+      https://circleci.com/setup-project/gh/giantswarm/REPOSITORY_NAME
+
+    - Import RELEASE_TOKEN variable from template repository for the builds:
+      https://circleci.com/gh/giantswarm/REPOSITORY_NAME/edit#env-vars
+
+    - Change the badge (with style=shield):
+      https://circleci.com/gh/giantswarm/REPOSITORY_NAME/edit#badges
+      If this is a private repository token with scope `status` will be needed.
+
+    - Run `devctl replace -i "REPOSITORY_NAME" "$(basename $(git rev-parse --show-toplevel))" *.md`
+      and commit your changes.
+
+-->
 [![CircleCI](https://circleci.com/gh/giantswarm/template-operator.svg?&style=shield)](https://circleci.com/gh/giantswarm/template-operator) [![Docker Repository on Quay](https://quay.io/repository/giantswarm/template-operator/status "Docker Repository on Quay")](https://quay.io/repository/giantswarm/template-operator)
 
-# template-operator
+# REPOSITORY_NAME
 
 This is a template repository containing files for a giantswarm
 operator repository.

docs/pull_request_template.md

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+## Checklist
+
+- [ ] Update changelog in CHANGELOG.md.