add swagger doc
<artifactId>ledger-impl</artifactId>
<version>0.8.0-SNAPSHOT</version>
</dependency>
+ <dependency>
+ <groupId>io.swagger</groupId>
+ <artifactId>swagger-jersey2-jaxrs</artifactId>
+ <version>1.5.18</version>
+ </dependency>
</dependencies>
<build>
<plugins>
