Add additional resources, project ideas and open source to React guide

[duttakapil]

We need to add the following to the current React guide

• Additional resources for learning React (books, awesome list, courses etc)
• Complete project ideas to apply all the concepts listed in the guide
• Open Source projects built on React (including React) to contribute to

CC : @M-ZubairAhmed and @aravindballa

[M-ZubairAhmed]

@aravindballa Can you please add task for

• Lifting state up

[elevenpassin]

Maybe there should also be some sample projects that people can look up to when they're stuck and are alone.

[duttakapil]

What should we do with this PR?
@M-ZubairAhmed @aravindballa @buoyantair