Add .mocharc.json configuration file for test setup

Author: harshithad0703

packages/contentstack-config/.mocharc.json

@@ -0,0 +1,6 @@
+{
+  "require": ["ts-node/register", "source-map-support/register"],
+  "watch-extensions": ["ts"],
+  "recursive": true,
+  "timeout": 10000
+}