Updating Strategic Plan repository

[kariljordan]

This pull requests provides updates to the strategic plan repository to clarify contribution guidelines. It includes the following:

• Updated README to include how the repo is organized, how to contribute, how to interact with the issues and project board, and how to get in touch with the Carpentries team.
• Added License

Additionally, each team lead is adding an intro paragraph to their respective issues for context. Intro paragraphs will be updated by Tuesday, 19 May. Intro paragraphs for issues that I monitor are located here so that you can see an example.

EC members, please review these revisions so that you are prepared to vote on the Year One Strategic Plan.

[orchid00]

Hi @kariljordan looks great, that for that effort. I will just add in the README the dates (Strategic Plan for 2020-2025).

[zjsteyn]

Good, think we can go ahead

[mesfind]

Good!!

[kariljordan]

I am merging this PR since it has been approved by everyone.