add missing javadoc lines

Author: lbalmaceda

README.md

@@ -271,6 +271,7 @@ The Management API is divided into different entities. Each of them have the lis
 * **Stats:** See [Docs](https://auth0.com/docs/api/management/v2#!/Stats/get_active_users). Access the methods by calling `mgmt.stats()`.
 * **Tenants:** See [Docs](https://auth0.com/docs/api/management/v2#!/Tenants/get_settings). Access the methods by calling `mgmt.tenants()`.
 * **Tickets:** See [Docs](https://auth0.com/docs/api/management/v2#!/Tickets/post_email_verification). Access the methods by calling `mgmt.tickets()`.
+* **Resource Servers:** See [Docs](https://auth0.com/docs/api/management/v2#!/Resource_Servers/get_resource_servers). Access the methods by calling `mgmt.resourceServers()`.
 
 
 ### Users

src/main/java/com/auth0/client/mgmt/ManagementAPI.java

@@ -114,7 +114,7 @@ public ConnectionsEntity connections() {
     public DeviceCredentialsEntity deviceCredentials() {
         return new DeviceCredentialsEntity(client, baseUrl, apiToken);
     }
-    
+
     /**
      * Getter for the Grants entity.
      *
@@ -214,6 +214,11 @@ public TicketsEntity tickets() {
         return new TicketsEntity(client, baseUrl, apiToken);
     }
 
+    /**
+     * Getter for the Resource Servers entity.
+     *
+     * @return the Resource Servers entity.
+     */
     public ResourceServerEntity resourceServers(){
         return new ResourceServerEntity(client, baseUrl, apiToken);
     }

src/main/java/com/auth0/client/mgmt/ResourceServerEntity.java

@@ -11,6 +11,9 @@
 import okhttp3.HttpUrl;
 import okhttp3.OkHttpClient;
 
+/**
+ * Class that provides an implementation of the Resource Server methods of the Management API as defined in https://auth0.com/docs/api/management/v2#!/Resource_Servers
+ */
 public class ResourceServerEntity  {
     private OkHttpClient client;
     private HttpUrl baseUrl;