[CORD-2045] move files from 3.0 to 4.1; include copyright

Change-Id: Ie9675d198be1b36aea818935b8f264e7f5da7ffa
(cherry picked from commit 786c4c5b11171289cbfbb6f5b12586840aef206b)
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..485dee6
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+.idea