message: Add link to wiki from CONTRIBUTING.md
  Fixes
diff: # Contributing
  -This project welcomes contributions and suggestions. Most contributions require you to agree to a Contributor License
  -Agreement (CLA) declaring that you have the right to, and actually do, grant us the rights to use your contribution. For
  -details, visit https://cla.microsoft.com.
  +This project welcomes contributions and suggestions. Detailed instructions for working in the repo
  +can be found in the [Wiki](https://github.com/microsoft/FluidFramework/wiki).
  +
  +Most contributions require you to agree to a Contributor License Agreement (CLA) declaring that you have the right to,
  +and actually do, grant us the rights to use your contribution. For details, visit https://cla.microsoft.com.
  When you submit a pull request, a CLA-bot will automatically determine whether you need to provide a CLA and decorate
  the PR appropriately (e.g., label, comment). Simply follow the instructions provided by the bot. You will only need to
  