feat: adds README.md file

README.md

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+Add a map to your Android app (Kotlin with Compose) codelab
+======================================
+
+## Description
+Accompanying starter and solution code for the [Add a map to your Android app (Kotlin with Compose) codelab ][codelab] codelab.
+
+## Support
+If you find a bug, please [file an issue]. Or, if you'd like to contribute, send us a [pull request] and refer to our [code of conduct].
+
+[codelab]: https://developers.google.com/codelabs/maps-platform/maps-platform-101-compose#0
+[file an issue]: https://github.com/googlemaps-samples/codelab-maps-platform-101-compose/issues
+[pull request]: https://github.com/googlemaps-samples/codelab-maps-platform-101-compose/compare
+[code of conduct]: CODE_OF_CONDUCT.md