docs: readme

License: MIT
Signed-off-by: Henrique Dias <[email protected]>

README.md

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+# Testground Sync Service
+
+![Testground logo](https://raw.githubusercontent.com/testground/pm/master/logo/TG_Banner_GitHub.jpg)
+
+[![Made by Protocol Labs](https://img.shields.io/badge/made%20by-Protocol%20Labs-blue.svg?style=flat-square)](http://protocol.ai)
+![Go version](https://img.shields.io/badge/go-%3E%3D1.16.0-blue.svg?style=flat-square)
+[![GoDoc](https://img.shields.io/badge/godoc-reference-5272B4.svg?style=flat-square)](https://pkg.go.dev/github.com/testground/sdk-go)
+[![CircleCI](https://circleci.com/gh/testground/sdk-go.svg?style=svg)](https://circleci.com/gh/testground/sdk-go)
+
+This repository contains the service that [Testground](https://github.com/testground/testground) uses for synchronization between multiple test instances.
+
+## Issues
+
+Please report issues in the [`testground/testground` repo](https://github.com/testground/testground/issues).
+
+## License
+
+Dual-licensed: [MIT](./LICENSE-MIT), [Apache Software License v2](./LICENSE-APACHE), by way of the
+[Permissive License Stack](https://protocol.ai/blog/announcing-the-permissive-license-stack/).