Port the "Why fuzz?" document to docs. (#76)
Port the "Why fuzz?" document to docs. (#76)

* Port the "Why fuzz?" document to docs.

* Fix links for fuzzing successes.

* Minor formatting fix + remove a missed reference to google3.

* Add notes about CF and OSS-Fuzz.

Co-authored-by: Martin Barbella <98699d80167e7d40ec82a0b1ec72d18dbcc64afc@google.com>
google/fuzzing,google/fuzzing