docs(readme): update Usage Tutorial

README.md

@@ -4,7 +4,83 @@
 
 Docker image for qBittorrent. 
 
+## Usage
+
+Pull this image:
+
+```shell
+docker pull ghcr.io/mogeko/qbittorrent:edge
+```
+
+Run with docker cli:
+
+```shell
+docker run -d \
+  --name qbittorrent \
+  -e QBT_WEBUI_PORT=8080 \
+  -p 6881:6881 \
+  -p 6881:6881/udp \
+  -p 8080:8080 \
+  -v /path/to/downloads:/downloads \
+  --restart unless-stopped \
+  ghcr.io/mogeko/qbittorrent
+```
+
+Run with [docker-compose]:
+
+```yml
+---
+version: 2.1
+services:
+  qbittorrent:
+    image: ghcr.io/mogeko/qbittorrent
+    container_name: qbittorrent
+    environment:
+      - QBT_WEBUI_PORT=8080
+    volumes:
+      - /path/to/downloads:/downloads
+    ports:
+      - 6881:6881
+      - 6881:6881/udp
+      - 8080:8080
+    restart: unless-stopped
+```
+
+## Parameters
+
+Container images are configured using parameters passed at runtime (such as those above). These parameters are separated by a colon and indicate `<external>:<internal>` respectively. For example, `-p 8080:80` would expose port `80` from inside the container to be accessible from the host's IP on port `8080` outside the container.
+
+| Parameter                | Function                      |
+|--------------------------|-------------------------------|
+| `-p 6881`                | tcp connection port           |
+| `-p 6881/udp`            | udp connection port           |
+| `-p 8080`                | The Web UI port               |
+| `-e QBT_WEBUI_PORT=8080` | Change the Web UI port        |
+| `-v /downloads`          | Location of downloads on disk |
+
+The `qbittorrent-nox`'s options may be supplied via environment variables[^1]. For option named 'parameter-name', environment variable name is `QBT_PARAMETER_NAME` (in uppercase, `-` replaced with `_`). To pass flag values, set the variable to `1` or `TRUE`. Here is an example we already in used: `-e QBT_WEBUI_PORT=8080`.
+
+More help message about `qbittorrent-nox`, you can get via:
+
+```shell
+docker run -it ghcr.io/mogeko/qbittorrent:edge --help
+```
+
+## License
+
+The code in this project is released under the [GPL-3.0 License][license].
+
+
+<!-- footnote -->
+
+[^1]: The option `QBT_PROFILE` does not support.
+
 <!-- badge -->
 
 [ci_icon]: https://github.com/mogeko/docker-qbittorrent/actions/workflows/auto-update.yml/badge.svg
 [ci_link]: https://github.com/mogeko/docker-qbittorrent/actions/workflows/auto-update.yml
+
+<!-- links -->
+
+[docker-compose]: https://docs.docker.com/compose
+[license]: https://github.com/mogeko/docker-qbittorrent/blob/master/LICENSE