Adding in codeowners file (#735)

Author: cleemullins

.github/CODEOWNERS

@@ -0,0 +1,21 @@
+# Lines starting with '#' are comments.
+# Each line is a file pattern followed by one or more owners.
+
+# More details are here: https://help.github.com/articles/about-codeowners/
+
+# The '*' pattern is global owners.
+
+# Order is important. The last matching pattern has the most precedence.
+# The folders are ordered as follows:
+
+# In each subsection folders are ordered first by depth, then alphabetically.
+# This should make it easy to add new rules without breaking existing ones.
+
+# Global rule:
+* @cleemullins @munozemilio
+
+/build/**                          @munozemilio
+/data/**                           @munozemilio
+/packages/**                       @munozemilio
+/scripts/**                        @munozemilio
+/specs/**                          @vishwacsena @scheyal