Add dokka to build javadoc

pom.xml

@@ -218,6 +218,19 @@
                     </dependency>
                 </dependencies>
             </plugin>
+            <plugin>
+                <groupId>org.jetbrains.dokka</groupId>
+                <artifactId>dokka-maven-plugin</artifactId>
+                <version>1.9.10</version>
+                <executions>
+                    <execution>
+                        <phase>pre-site</phase>
+                        <goals>
+                            <goal>dokka</goal>
+                        </goals>
+                    </execution>
+                </executions>
+            </plugin>
         </plugins>
     </build>
 </project>