add live status summary for readme.MD
+[![Build Status](https://travis-ci.org/alibaba/jetcache.svg?branch=master)](https://travis-ci.org/alibaba/jetcache)
+[![Maven Central](https://maven-badges.herokuapp.com/maven-central/com.alicp.jetcache/jetcache-parent/badge.svg)](https://maven-badges.herokuapp.com/maven-central/com.alicp.jetcache/jetcache-parent/)
+[![GitHub release](https://img.shields.io/github/release/alibaba/jetcache.svg)](https://github.com/alibaba/jetcache/releases)
+[![License](https://img.shields.io/badge/license-Apache%202-4EB1BA.svg)](https://www.apache.org/licenses/LICENSE-2.0.html)
+
# introduction
JetCache is a Java cache abstraction which provides consistent use for various caching solutions.
Presently it support Redis and Alibaba Tair and Caffeine cache as embedded cache.
