Add license and README

LICENSE

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+MIT License
+
+Copyright (c) 2023 Ruben Anders
+
+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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 # recent-messages-formatter
+
+## Usage
+
+```
+Simple program to fetch a Twitch channel's recent messages and to print all normal messages in a simple readable format.
+
+Usage: recent-messages-formatter <CHANNEL_LOGIN>
+
+Arguments:
+  <CHANNEL_LOGIN>  The channel login of the Twitch channel to fetch. E.g. `pajlada` or `riotgames`
+
+Options:
+  -h, --help     Print help
+  -V, --version  Print version
+```
+
+## Building
+
+1. Install Rust (https://www.rust-lang.org/)
+2. `git clone https://github.com/robotty/recent-messages-formatter.git`
+3. `cd recent-messages-formatter`
+4. `cargo build --release`
+5. You can find the built executable in `./target/release/recent-messages-formatter`. Feel free to copy this file to wherever you need it, it does not need any other files around it (It is statically linked).
+6. Try it out: `./target/release/recent-messages-formatter pajlada`
+
+This process works on Linux, Mac and Windows. Note that on Windows, `./target/release/recent-messages-formatter` becomes `./target/release/recent-messages-formatter.exe`.