New Page: Open Source

We need a new page to support our tools and other products.

[Wireframe - Open Source.pdf](https://github.com/redbluegames/redbluegames.github.com/files/2189507/Wireframe.-.Open.Source.pdf)

- [ ] Pick a template for Bootstrap
- [ ] Create necessary liquid template
- [ ] Fill page with stub content
- [ ] Fill page with actual content