Adding Javadoc badge

README.md

@@ -1,9 +1,9 @@
 Welcome to project Druidry!
 =======================================
 
-![build_status](https://api.travis-ci.org/zapr-oss/druidry.svg?branch=master) [![License: Apache License 2](https://img.shields.io/badge/license-Apache%202-blue.svg)](https://www.apache.org/licenses/LICENSE-2.0.txt)
+![build_status](https://api.travis-ci.org/zapr-oss/druidry.svg?branch=master) [![License: Apache License 2](https://img.shields.io/badge/license-Apache%202-blue.svg)](https://www.apache.org/licenses/LICENSE-2.0.txt) [![javadoc](https://javadoc.io/badge2/in.zapr.druid/druidry/javadoc.svg)](https://javadoc.io/doc/in.zapr.druid/druidry)
 
-Druid is an extremely popular tool to perform OLAP queries on event data. Druid drives real-time dashboards in most of the organisations right now. We@Zapr love Druid! Therefore we want to contribute towards making Druid, even more, friendlier to the ever expanding community. 
+Druid is an extremely popular tool to perform OLAP queries on event data. Druid drives real-time dashboards in most of the organisations right now. We@Zapr love Druid! Therefore we want to contribute towards making Druid, even more, friendlier to the ever expanding community.
 
 We want to make the process of deep meaningful conversations with Druid little easier. What do we mean is that we don’t want developers to write big, scary JSON anymore but instead use a simple Java-based query generator to help with the querying. 
 
@@ -269,4 +269,4 @@ Contact
 
 For any features or bugs, please raise it in issues section
 
-If anything else, get in touch with us at [[email protected]]([email protected])
+If anything else, get in touch with us at [[email protected]]([email protected])