add NOTICE file

NOTICE

@@ -0,0 +1,16 @@
+Solution Libre website
+
+Copyright (C) 2017-2021 Solution Libre SAS
+
+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 <https://www.gnu.org/licenses/>.

README.md

@@ -18,7 +18,7 @@ Copyright (C) 2013-2016 Blackrock Digital LLC. Code released under the [MIT](htt
 
 ### Solution Libre's website
 
-Copyright (C) 2017-2021 Solution Libre SAS. Code released under the [GPL-3.0](https://raw.githubusercontent.com/solution-libre/website/master/LICENSE) license.
+Copyright (C) 2017-2021 Solution Libre SAS. Code released under the [AGPL-3.0](https://raw.githubusercontent.com/solution-libre/website/master/LICENSE) license.
 
 ## Development