[YUNIKORN-1639] Adda command in the Makefile to start json-server (#107)

Closes: #107

Signed-off-by: Craig Condit <ccondit@apache.org>
diff --git a/Makefile b/Makefile
index 8d36d79..1305a52 100644
--- a/Makefile
+++ b/Makefile
@@ -126,3 +126,8 @@
 .PHONY: run
 run: image
 	docker run -d -p ${PORT}:9889 ${REGISTRY}/yunikorn:web-${DOCKER_ARCH}-${VERSION}
+
+# Start the json-server based on the json-db and route.
+.PHONY: json-server
+json-server:
+	json-server ./json-db.json