Add license and update readme

files_admin/LICENSE.txt

@@ -0,0 +1,12 @@
+Copyright (C) 2019 Kopano and its licensors
+
+This program is free software: you can redistribute it and/or modify it under the terms of the
+GNU Affero General Public License as published by the Free Software Foundation, either version
+3 of the License, or (at your option) any later version.
+
+This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without
+even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 
+GNU Affero General Public License for more details.
+
+You should have received a copy of the GNU Affero General Public License along with this program.
+If not, see http://www.gnu.org/licenses/.

files_admin/README.md

@@ -19,4 +19,8 @@ Use the username and password provided in the config file
 # Dependencies
 
 - python-kopano
-- python-mapi
+- python-mapi
+
+# License
+
+licensed under GNU Affero General Public License v3.