chore: document release process

Author: alrex

RELEASING.md

@@ -0,0 +1,23 @@
+# Releasing
+
+Once all the changes for a release have been merged to master, ensure the following:
+
+- [ ] version has been updated in `VERSION`, `lightstep/version.py` and `setup.cfg` 
+- [ ] tests are passing
+- [ ] user facing documentation has been updated
+
+# Publishing
+
+Publishing to [pypi](https://pypi.org/project/lightstep/) is automated via GitHub actions. Once a tag is pushed to the repo, a new GitHub Release is created and package is published  via the actions defined here: https://github.com/lightstep/lightstep-tracer-python/blob/master/.github/workflows/release.yml
+
+```
+$ git clone git@github.com:lightstep/lightstep-tracer-python && cd lightstep-tracer-python
+# ensure the version matches the version beind released
+$ cat VERSION
+4.4.3
+$ cat lightstep/version.py
+LIGHTSTEP_PYTHON_TRACER_VERSION="4.4.3"
+$ cat setup.py | grep version
+    version='4.4.3',
+$ git tag v4.4.3 && git push origin v4.4.3
+```