Add .licenserc.yaml file

.licenserc.yaml

@@ -0,0 +1,19 @@
+header:
+  - paths:
+      - "**/*.c"
+      - "**/*.h"
+    license:
+      pattern: |
+        .*\.(c|h)
+        .*
+       
+        Portions Copyright © 2018-2020, Percona LLC and/or its affiliates
+       
+        Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+       
+        Portions Copyright (c) 1994, The Regents of the University of California
+       
+        IDENTIFICATION
+           contrib/pg_stat_monitor/.*\.(c|h)
+
+