[docs] Intro copy (#95)
[docs] Intro copy (#95)

* [docs] Intro copy

* Apply suggestions from code review

Co-authored-by: Billy Lamberta <f19f650a1e17457521955ce0659f67f487e6cab1@google.com>

Co-authored-by: Billy Lamberta <f19f650a1e17457521955ce0659f67f487e6cab1@google.com>
quantumlib/ReCirq,quantumlib/unitary,quantumlib/ReCirq,quantumlib/unitary