Fix java doc, make an about section, add the ubb logo

.idea/misc.xml

@@ -50,7 +50,7 @@
     <option name="OPTION_DOCUMENT_TAG_VERSION" value="true" />
     <option name="OPTION_DOCUMENT_TAG_DEPRECATED" value="true" />
     <option name="OPTION_DEPRECATED_LIST" value="true" />
-    <option name="OTHER_OPTIONS" />
+    <option name="OTHER_OPTIONS" value="-encoding utf8 -docencoding utf8 -charset utf8" />
     <option name="HEAP_SIZE" />
     <option name="LOCALE" value="es" />
     <option name="OPEN_IN_BROWSER" value="true" />