Started Dockerfile for backend service

Change-Id: I561f37c8026cc4ffbf3a9b80538094d24d076a32
diff --git a/.gitignore b/.gitignore
index 752da96..4e95513 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,5 +1,6 @@
 .*
 !/.gitignore
+!/.dockerignore
 target
 tmp
 logs