Basic contribution guide; point out website & wiki

[ShaneCurcuru]

[cewilliams]

Thanks for the contribution! Would you please update your website links to use the innersourcecommons.org versions of urls? Since this is more than a PayPal specific initiative we want to be clear that it can stand on its own.

[DuaneOBrien]

I don't know if you chatted about this, but in the Contributing, the advice is to submit a PR against the gh-pages branch, but if I understand the page generation process, wouldn't changes submitted directly to gh-pages get overwritten by the next Jekyl build?

[cewilliams]

Whups - good catch. Yes, the master branch holds the content, gh-pages branch is overwritten by the Jekyll build each time. More support issue #13 - I'd like to keep it as easy as possible to contribute.