docs: 📝 Create README

Add instructions to clone and execute the project

README.md

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+# Make This Playlist
+
+Make This Playlist is a web application that allows anyone to add music to a Spotify playlist without needing a Spotify account. The application is accessible at the following address: [Make This Playlist](https://makethisplaylist.louisgallet.fr).
+
+## Features
+- Creation of a playlist
+- Search for music on Spotify
+- Add music to a playlist
+
+## Installation
+
+### Docker
+You can install the application via Docker. To do this, execute the following command:
+```bash
+docker run -d \
+  -p 80:3000 \
+  -e client_id=SPOTIFY_CLIENT_ID \
+  -e client_secret=SPOTIFY_CLIENT_SECRET \
+  -e n8n_webhook=N8N_WEBHOOK_URL \
+  gitea.louisgallet.fr/lgallet/makethisplaylist:latest
+```
+
+### Manually
+To install the application manually, clone the repository and install the dependencies:
+```bash
+git clone https://gitea.louisgallet.fr/lgallet/makethisplaylist.git
+cd makethisplaylist
+pip install -r requirements.txt
+python main.py
+```