docs(README): initial version

Author: gr2m

README.md

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+# 🚧 Work in progress, see [#1](https://github.com/probot/example-google-cloud-function/pull/1)
+
+# Probot & Google Cloud Functions example
+
+This repository is an example of how to deploy the "Hello, World" of probot apps to [Google Cloud Functions (GCF)](https://cloud.google.com/functions).
+
+## License
+
+[ISC](LICENSE)