Add CODEOWNERS

Author: nandika

.github/CODEOWNERS

@@ -0,0 +1,7 @@
+# Lines starting with '#' are comments.
+# Each line is a file pattern followed by one or more owners.
+
+# See: https://help.github.com/articles/about-codeowners/
+
+# These owners will be the default owners for everything in the repo.
+*   @ashera96 @npamudika @CrowleyRajapakse