Enable shellcheck

Change-Id: I53bace2d0754df136d5443bffee9bbd41687cbbe
Signed-off-by: Adriana Kobylak <anoo@us.ibm.com>
diff --git a/.shellcheck b/.shellcheck
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/.shellcheck