add readme and license

LICENSE

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+MIT License
+
+Copyright (c) 2018 Jona Abdinghoff
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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+this is a simple [maubot](https://github.com/maubot/maubot) plugin which interacts with a [matrix-registration](https://github.com/zeratax/matrix-registration) deployment and generates invite tokens.
+
+modify the config to point to your matrix-registration url, include your admin secret to authenticate, and ensure that you're in the list of approved users.
+
+once your bot is running, simply use the command
+
+    !invite generate
+
+to generate a token with some generic text you can copy-paste when sharing it with your invitee!
+
+future plans to manage existing tokens seem like a good idea, although i don't know if i'll have the energy to implement. PRs are welcome!