Add license and more documentation

License.md

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+This is free and unencumbered software released into the public domain.
+
+Anyone is free to copy, modify, publish, use, compile, sell, or
+distribute this software, either in source code form or as a compiled
+binary, for any purpose, commercial or non-commercial, and by any
+means.
+
+In jurisdictions that recognize copyright laws, the author or authors
+of this software dedicate any and all copyright interest in the
+software to the public domain. We make this dedication for the benefit
+of the public at large and to the detriment of our heirs and
+successors. We intend this dedication to be an overt act of
+relinquishment in perpetuity of all present and future rights to this
+software under copyright law.
+
+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 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.
+
+For more information, please refer to <http://unlicense.org/>

Readme.md

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 ## URL parameters
 You can set the room for the section 'Next up here' by specifying either the (frab-XML) room name or room-guid.
 E.g. https://hacc.4future.dev/html-infobeamer/?room=60dd7f55-9f88-4de6-ad98-b9c4e2810300 or https://hacc.4future.dev/html-infobeamer/?room=hacc%20M%C3%BCnchen%20/%20about:future%20-%20M%C3%BCnchen
+
+## API
+This repo pulls the external data from `api.oct.re` (Server hosted by octycs)
+You can host everything yourself in case you have a Twitter API key.
+
+`api.oct.re/tweets-rc3.json` -> `dl_tweets.sh`
+`api.oct.re/fahrplan.json` -> `fahrplan.py`
+
+## License
+All parts of this software except the `fahrplan.py` downloader are licensed under the _Unlicense_ (see `License.md`)

dl_tweets.sh

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+#!/bin/bash
+export BEARER_TOKEN=<Enter your Bearer Token here>
+curl -s -X GET -H "Authorization: Bearer $BEARER_TOKEN" \
+	    "https://api.twitter.com/2/tweets/search/recent?query=%23rC3&tweet.fields=created_at&expansions=author_id,attachments.media_keys&media.fields=preview_image_url&user.fields=profile_image_url" > tweets-rc3.json