add badge sonarcube

https://sonarcloud.io/dashboard?id=zoedaemon_node-jwt-api

Author: zoedaemon

README.md

@@ -1,5 +1,6 @@
 #  node-jwt-api
 
+[![Quality Gate Status](https://sonarcloud.io/api/project_badges/measure?project=zoedaemon_node-jwt-api&metric=alert_status)](https://sonarcloud.io/dashboard?id=zoedaemon_node-jwt-api)
 
 ## Installation
 Based on [user-registration-api](https://github.com/fatukunda/user-registration-api)
@@ -26,4 +27,4 @@ MIT
 
 **zoed**
 
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+[//]: # (These are reference links used in the body of this note and get stripped out when the markdown processor does its job. There is no need to format nicely because it shouldn't be seen. Thanks SO - http://stackoverflow.com/questions/4823468/store-comments-in-markdown-syntax)