Add README.md

Signed-off-by: Abdulkadir Furkan Şanlı <me@abdulocra.cy>

README.md

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+# ParkerBot
+
+ParkerBot is a Matrix bot that monitors a channel for YouTube links and
+generates weekly playlists from them.
+
+## Installation
+
+1. Clone the repo
+2. Install the dependencies, preferably in a venv:
+  ```shell
+  python -m venv venv
+  source ./venv/bin/activate
+  pip3 install -r requirements.txt
+  ```
+
+## Running
+
+1. Execute `main.py`: `./main.py`