Create CODEOWNERS

Closes #77.

PiperOrigin-RevId: 231955795
diff --git a/CODEOWNERS b/CODEOWNERS
new file mode 100644
index 0000000..6ccc6a5
--- /dev/null
+++ b/CODEOWNERS
@@ -0,0 +1 @@
+* @dierksen @DavidGoldman @reinhillmann @ivanhernandez13