Adden user data completion and docs correction

buisnesslogic/src/main/java/com/plannaplan/api/UsosOauth1Service.java

@@ -2,6 +2,9 @@ package com.plannaplan.api;
 
 import com.github.scribejava.core.builder.api.DefaultApi10a;
 
+/**
+ * singleton class to sign usos api requests with oauth
+ */
 public class UsosOauth1Service extends DefaultApi10a {
 
     private static final String AUTHORIZE_URL = "https://usosapidemo.amu.edu.pl/services/oauth/authorize";
@@ -30,6 +33,12 @@ public class UsosOauth1Service extends DefaultApi10a {
         return InstanceHolder.INSTANCE;
     }
 
+    /**
+     * get instance withj scopes
+     * 
+     * @param scopes to get instance with
+     * @return UsosOauth1Service instance
+     */
     public static UsosOauth1Service instance(String... scopes) {
         return scopes == null || scopes.length == 0 ? instance() : new UsosOauth1Service(scopes);
     }