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README.md

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+# dc-nogi 
+
+Does the thing
+
+## Setup
+
+1. Install Python 3.10 or newer.
+2. Install dependencies:
+   ```
+   pip install -r requirements.txt
+   ```
+3. Copy `config.example.json` to `config.json` and fill in:
+   - `token`: your account token (Discord dev tools -> Network tab -> any
+     request -> `authorization` header, while logged into the Discord web app).
+   - `friend_id`: your friend's numeric Discord user ID (enable Developer Mode
+     in Discord settings, right-click their name -> Copy User ID).
+   - `emoji`: the unicode emoji to react with, e.g. `"🫄"`.
+   - `days_back`: how many days of history to scan on first run (default 10).
+   - `manual_guild_ids` (optional): guild IDs to always include, used as a
+     fallback if the mutual-guilds lookup ever fails or misses a server.
+4. Run it:
+   ```
+   python main.py
+   ```
+
+## Usage
+
+```
+python main.py            # run normally: backlog scan, then live watching
+python main.py --undo     # remove every reaction this script has ever added, then exit
+```