Update README.md

README.md

@@ -3,6 +3,7 @@
 ![GitHub branch check runs](https://img.shields.io/github/check-runs/tomaytotomato/location4j/master)
 [![Bugs](https://sonarcloud.io/api/project_badges/measure?project=tomaytotomato_location4j&metric=bugs)](https://sonarcloud.io/summary/new_code?id=tomaytotomato_location4j)
 [![Quality Gate Status](https://sonarcloud.io/api/project_badges/measure?project=tomaytotomato_location4j&metric=alert_status)](https://sonarcloud.io/summary/new_code?id=tomaytotomato_location4j)
+[![javadoc](https://javadoc.io/badge2/com.tomaytotomato/location4j/javadoc.svg)](https://javadoc.io/doc/com.tomaytotomato/location4j) 
 ![GitHub commit activity](https://img.shields.io/github/commit-activity/m/tomaytotomato/location4j)
 ![GitHub License](https://img.shields.io/github/license/tomaytotomato/location4j)