Implement workflow essence extractor
- Extract useful information from airflow workflow code
- Produce "essence" as a json output
- Output will be passed to workflow controller for workflow management

No source code change.

Change-Id: I01de9939fdf699522e81c369676c33c73a38b4bc
diff --git a/.gitreview b/.gitreview
new file mode 100644
index 0000000..1c0dbdc
--- /dev/null
+++ b/.gitreview
@@ -0,0 +1,5 @@
+[gerrit]
+host=gerrit.opencord.org
+port=29418
+project=cord-workflow-airflow.git
+defaultremote=origin