meta: Adopt CODEOWNERS first pass

.github/CODEOWNERS

@@ -0,0 +1,20 @@
+# Legal
+/LICENSE  @getsentry/owners-legal
+
+# Migrations
+south_migrations/  @getsentry/owners-migrations
+
+# Snuba
+/src/sentry/eventstream/        @getsentry/owners-snuba
+/src/sentry/utils/snuba.py      @getsentry/owners-snuba
+/src/sentry/tsdb/snuba.py       @getsentry/owners-snuba
+/src/sentry/tsdb/redissnuba.py  @getsentry/owners-snuba
+/src/sentry/search/snuba/       @getsentry/owners-snuba
+/src/sentry/tagstore/snuba/     @getsentry/owners-snuba
+
+# Ted stuff
+/src/sentry/similarity/              @tkaemming
+/src/sentry/receivers/similarity.py  @tkaemming
+/src/sentry/digests/                 @tkaemming
+/src/sentry/tasks/reports.py         @tkaemming
+/src/sentry/tasks/digests.py         @tkaemming