Add VRS annotator example workflows

[theferrit32]

Create examples folder with markdown file pointing to different use cases, e.g. https://github.com/gks-anvil

Maybe include a slim example like:
https://github.com/ga4gh/vrs-python/blob/feature/vrs-in-a-box/vrs-in-a-box/VrsVcfAnnotator.wdl

@ahwagner