docs: Add Release 22 runtime example and crane to README (!3)
* Add short summary blurb at top of README.
* Add Release 22 example of a possible Python virtual environment.
* Add crane as an alternative to tracking the TWikis.
* Add short summary blurb at top of README.
* Add Release 22 example of a possible Python virtual environment.
* Add crane as an alternative to tracking the TWikis.