chore: add samples/cloud-nebulous-serverless/README.md (#312)

* connect Python Translate client library to nebulous serverless example

* added Samples section to README

* fix path

* update README

* fix README link

* move sample info to README

* fix RST formatting

* chore: update RST for Sphinx lint

* chore: update README for RST style

* updated serverless sample README

Co-authored-by: Dan Lee <71398022+dandhlee@users.noreply.github.com>
Co-authored-by: Anthonios Partheniou <partheniou@google.com>

translation/samples/cloud-nebulous-serverless/README.md

@@ -0,0 +1 @@
+This sample, demonstrating how to access the [Cloud Translation API](https://cloud.google.com/translate) from [Google Cloud serverless platforms](https://cloud.google.com/serverless) (App Engine, Cloud Functions, Cloud Run) can be found at <https://github.com/googlecodelabs/cloud-nebulous-serverless/tree/main/cloud>. Versions in Python (2.7 and 3.7+) and Node.js (10+) are available along with hands-on tutorials.