Add README.md (#189)

Co-authored-by: Ethan Dickson <[email protected]>

Author: blink-so[bot]

README.md

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+# Coder Desktop for macOS
+
+Coder Desktop allows you to work on your Coder workspaces as though they're
+on your local network, with no port-forwarding required.
+
+## Features:
+
+- Make your workspaces accessible from a `.coder` hostname.
+- Configure bidirectional file sync sessions between local and remote
+  directories.
+- Convenient one-click access to Coder workspace app IDEs, tools and VNC/RDP clients.
+
+Learn more about Coder Desktop in the
+[official documentation](https://coder.com/docs/user-guides/desktop).
+
+This repo contains the Swift source code for Coder Desktop for macOS. You can
+download the latest version from the GitHub releases.
+
+## Contributing
+
+See [CONTRIBUTING.MD](CONTRIBUTING.md)
+
+## License
+
+The Coder Desktop for macOS source is licensed under the GNU Affero General
+Public License v3.0 (AGPL-3.0).
+
+Some vendored files in this repo are licensed separately. The license for these
+files can be found in the same directory as the files.