Add info about force on javadocs

src/main/java/eu/dnetlib/dnetrolemanagement/controllers/AdminController.java

@@ -52,6 +52,7 @@ public class AdminController {
 
     /**
      * Assign admin role to logged in user or user with @email
+     * If role doesn't exists or user is not a member of this group already, use force=true to create and assign both roles.
      */
     @RequestMapping(value = "/{type}/{id}", method = RequestMethod.POST)
     public ResponseEntity<Response> assignRole(@PathVariable("type") String type, @PathVariable("id") String id, @RequestParam(required = false) String email,

src/main/java/eu/dnetlib/dnetrolemanagement/controllers/MemberController.java

@@ -69,6 +69,7 @@ public class MemberController {
 
     /**
      * Assign member role to logged in user or user with @email
+     * If role doesn't exists, use force=true to create and assign the role
      */
     @RequestMapping(value = "/{type}/{id}", method = RequestMethod.POST)
     public ResponseEntity<Response> assignRole(@PathVariable("type") String type, @PathVariable("id") String id, @RequestParam(required = false) String email,
@@ -97,6 +98,7 @@ public class MemberController {
 
     /**
      * Remove member role from logged in user or user with @email
+     * If user is an admin of this group, use force=true to revoke both roles
      */
     @RequestMapping(value = "/{type}/{id}", method = RequestMethod.DELETE)
     public ResponseEntity<Response> removeRole(@PathVariable("type") String type, @PathVariable("id") String id, @RequestParam(required = false) String email,