Added os_selection rhel 7.0
diff --git a/os/rhel70.yml b/os/rhel70.yml
new file mode 100644
index 0000000..4bb3bb3
--- /dev/null
+++ b/os/rhel70.yml
@@ -0,0 +1,3 @@
+---
+# rhel 7.0
+image_id: ami-a8d369c0