[AV-1891] Add code owners (#141)

* Add CODEOWNERS

* Add newline

Co-authored-by: Patrick O'Grady <prohb125@gmail.com>

.github/CODEOWNERS

@@ -0,0 +1,9 @@
+# Each line is a file pattern followed by one or more owners.
+
+# These owners will be the default code owners for everything in the repo.
+# Unless a later match takes precedence, these owners will be requested for
+# review whenever someone opens a pull request.
+* @ceyonur @darioush @patrick-ogrady @aaronbuchwald
+
+# These owners will be the owner of the contract-examples sub-directory.
+contract-examples/ @dasconnor