Add additional badges

Author: dmaccormack

README.md

@@ -1,9 +1,13 @@
 # JSON->URL
 [![Apache License, Version 2.0, January 2004](https://img.shields.io/github/license/jsonurl/jsonurl-java.svg?label=License)](https://www.apache.org/licenses/LICENSE-2.0)
 [![Release](https://img.shields.io/github/release/jsonurl/jsonurl-java.svg?label=Release)](https://search.maven.org/search?q=g:org.jsonurl)
+[![javadoc](https://javadoc.io/badge2/org.jsonurl/jsonurl-core/javadoc.svg)](https://javadoc.io/doc/org.jsonurl/jsonurl-core)
 [![Build Status](https://travis-ci.com/jsonurl/jsonurl-java.svg?branch=master)](https://travis-ci.com/jsonurl/jsonurl-java)
 [![Quality Gate](https://sonarcloud.io/api/project_badges/measure?project=jsonurl_jsonurl-java&metric=alert_status)](https://sonarcloud.io/dashboard?id=jsonurl_jsonurl-java)
-[![javadoc](https://javadoc.io/badge2/org.jsonurl/jsonurl-core/javadoc.svg)](https://javadoc.io/doc/org.jsonurl/jsonurl-core)
+[![Lines of Code](https://sonarcloud.io/api/project_badges/measure?project=jsonurl_jsonurl-java&metric=ncloc)](https://sonarcloud.io/dashboard?id=jsonurl_jsonurl-java)
+[![Security Rating](https://sonarcloud.io/api/project_badges/measure?project=jsonurl_jsonurl-java&metric=security_rating)](https://sonarcloud.io/dashboard?id=jsonurl_jsonurl-java)
+[![Vulnerabilities](https://sonarcloud.io/api/project_badges/measure?project=jsonurl_jsonurl-java&metric=vulnerabilities)](https://sonarcloud.io/dashboard?id=jsonurl_jsonurl-java)
+[![Maintainability Rating](https://sonarcloud.io/api/project_badges/measure?project=jsonurl_jsonurl-java&metric=sqale_rating)](https://sonarcloud.io/dashboard?id=jsonurl_jsonurl-java)
 
 org.json module: [![Known Vulnerabilities](https://snyk.io/test/github/jsonurl/jsonurl-java/badge.svg?targetFile=module/jsonurl-jsonorg/pom.xml)](https://snyk.io/test/github/jsonurl/jsonurl-java?targetFile=module/jsonurl-jsonorg/pom.xml)
 [![javadoc](https://javadoc.io/badge2/org.jsonurl/jsonurl-jsonorg/javadoc.svg)](https://javadoc.io/doc/org.jsonurl/jsonurl-jsonorg)