New Release doc outlining release steps.

Author: pglombardo

RELEASE.md

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+# Release Steps
+
+_Note: To release a new Instana package, you must be a project member of the [Instana package project on Pypi](https://pypi.org/project/instana/).
+Contact [Peter Giacomo Lombardo](https://github.com/pglombardo) to be added._
+
+1. Before releasing, assure that [tests have passed](https://circleci.com/gh/instana/workflows/python-sensor) and that the package has also been manually validated in various stacks.
+2. `git checkout master && git pull --rebase && pip install -U twine`
+3. Bump the package version in `setup.py`
+4. Create a [draft Release on Github](https://github.com/instana/python-sensor/releases)
+5. `python setup.py sdist bdist_wheel` to create the whl file in `./dist/` 
+6. Upload the package to Pypi with twine: `twine upload dist/instana-<version>*`
+7. Validate the new release on https://pypi.org/project/instana/
+8. Update Python documentation with latest changes: https://docs.instana.io/ecosystem/python/
+9. Publish the draft release on [Github](https://github.com/instana/python-sensor/releases)