Add README and CHANGELOG

Author: davegaeddert

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).
+
+## [Unreleased]
+
+Nothing yet.
+
+## [0.1.0] - 2020-09-05
+
+The first release! Includes the `sync` command which will sync your `CHANGELOG.md` to GitHub Release notes.
+
+[Unreleased]: https://github.com/dropseed/sitechecks/compare/0.1.0...HEAD
+[0.1.0]: https://github.com/dropseed/sitechecks/releases/tag/0.1.0

README.md

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+# changerelease
+
+Sync your GitHub Release notes with your `CHANGELOG.md`.
+
+This tool expects that you follow the [Keep a Changelog](https://keepachangelog.com/) format.
+
+## Use the GitHub Action
+
+```yml
+name: changerelease
+on:
+  workflow_dispatch: {}
+  push:
+    paths: [CHANGELOG.md]
+    branches: [$default-branch]
+    tags: ["*"]
+
+jobs:
+  sync:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - uses: dropseed/changerelease
+```