Add readme and license files

LICENSE

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+The MIT License (MIT)
+
+Copyright (c) 2023 aNNiMON
+
+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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+# ffmpegbot
+
+Telegram Bot for re-encoding media
+
+## Features
+
+ - change a video resolution, bitrate, frame rate, speed
+ - change an audio bitrate, volume, pitch
+ - apply audio effects
+ - extract or remove audio from the video
+ - resend video note as a regular video, or video as an audio track
+
+## Requirements
+
+ - Telegram bot username and token, [@BotFather](https://t.me/BotFather)
+ - JRE 16+ or JDK 16+ (for build)
+ - `ffmpeg` must be installed and available in `PATH`.
+ - `yt-dlp` for `/dl` command.
+
+## Installation
+
+```bash
+# Build
+./gradlew shadowJar
+# Config
+cp ffmpegbot.yaml.template ffmpegbot.yaml
+vim ffmpegbot.yaml
+# Run
+java -jar ./build/libs/ffmpegbot-1.0-SNAPSHOT-all.jar
+```