Adding the current features to README

Author: RyanSiu1995

README.md

@@ -4,6 +4,11 @@
 
 For the current version of Google cloud build, it supports the async process with the variable `waitFor`. With the growth of complexity of your pipeline, it will be hard to maintain the async flow. Unlike Jenkins and CircleCI, there is no visualizer for your pipeline. This application aims at visualize the pipeline and help the developers to debug their cloud build.
 
+## Current features
+* YAML format cloud build definition digestion
+* Temporary graph rendering
+* Save graph as dot, png, jpg or jpeg
+
 ## Rule of cloud build async process
 From the Google [docs](https://cloud.google.com/cloud-build/docs/configuring-builds/configure-build-step-order), there are a few rules for the async process.
 1. If no values are provided for waitFor, the build step waits for all prior build steps in the build request to complete successfully before running.