Document Runtime Validation WG mission, strategy, and approach

[eddie-knight]

Part of #298

• Why does this working group exist?
• What are the main, high level objectives this group is working toward?
  • This should be a short list of objectives that contribute to the mission
• How are each of those objectives being pursued?
  • What type of activities are we doing to make progress?
  • What are some common work items?
  • How do we know when each objective is complete?
• How is work tracked relating to each of these objectives?
  • The work tracker is already set up, but needs to be documented
  • For common types of work items:
    • How do we know when the work is ready to start?
    • What are the requirements for each to be considered complete?
• What is the best way for a new contributor to begin contributing to this work?
  • We just need to clarify a practical process for new contributors to get started actively contributing