Docs: add GitHub PR template and link to contributing docs am: d57e268ce1
Docs: add GitHub PR template and link to contributing docs am: d57e268ce1

Original change: https://android-review.googlesource.com/c/platform/external/perfetto/+/1490517

Change-Id: Ib23acf7f146bedb9be51b2b787b5debb4ac54fc9

google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto