Write a FAQ

[brettcannon]

Make it less explanatory in the README. Pull questions from:

• https://news.ycombinator.com/item?id=10984514
• https://www.reddit.com/r/Python/comments/40h8ub/pyjion_a_python_jit_based_on_coreclr_and_cpython/
• https://www.reddit.com/comments/43a4l2
• https://www.reddit.com/r/programming/comments/433tmx/pyjion_a_jit_for_python_based_upon_coreclr/