Add License

[fkohrt]

Hi, I just read your blog post on password sharing and am excited that you shared the source code of your app. In order for others to host it by themselves (which I'd personally love to do given the sensitive nature of passwords), could you choose a license that allows others to use your project? The Apache 2.0 license is a great permissive license, while the GNU AGPLv3 is a great copyleft license that requires others to share changes under the same license. E.g. the latter can selected by adding the license text as a new file COPYING.txt to your repository and then adding the following statement to your README.md:

Copyright (C) <year>  <name of author>

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/>.