Add Readme and Unlicense

Readme.md

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+# Service[IM]: Prosody + Slidge
+
+Simple XMPP deployment for legacy IM platforms interaction.
+
+## Usage
+
+### Setup
+1. Set the `ADMIN_EMAIL` and `DOMAIN_NAME` variables in `.env`
+2. Run `docker compose up -d`
+3. Add a user with `docker compose exec -ti prosody prosodyctl adduser USERNAME@DOMAIN_NAME`
+4. Enjoy
+
+### Whatsapp Login
+1. Start a chat with `whatsapp` as JID
+2. Send `register`
+3. Answer the questions
+4. Scan the QR with the Whatsapp mobile app
+5. Wait and chat

UNLICENSE

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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 <https://unlicense.org/>