[readme] Added FAQ: how long until PR merged?
[readme] Added FAQ: how long until PR merged?

This is by far the question which gets asked the most on the DT gitter, so I thought it would be a good idea to add it to the FAQ. I don't really have any authority to answer the question, so the answer is mostly a placeholder at this point; it would be better to have an official answer. @andy-ms would you rather not be tagged after a week?
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