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0.1.0: Preparing the cookbook for supermarket consumption.

This includes:
- changelog for all previous additions
- contributing guide
- testing guide
- some changes to how we update versions and tagging, this was dur to some feedback I got (awaiting an issue with more details) in wrapper cookbooks when pulling from the github repo rather than from the supermarket itself.
- fixes/improvements to pr/issue templates
- release docs

Signed-off-by: Ben Abrams <[email protected]>