Add usage docs (#7)

README.md

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+# hesk-docker
+HESK help desk, but in a Docker container.
+
+## Dependencies
+- You will need a MySQL/MariaDB database. This image does not include a database server so please deploy one before installing.
+
+## How to use
+*An example Docker Compose file is included in this repository.*
+
+1. See [this page](https://github.com/luketainton/hesk-docker/pkgs/container/hesk) for the latest version.
+2. Pull the version of the image that you want (e.g. latest): `docker pull ghcr.io/luketainton/hesk:latest`.
+3. Run the container: `docker run -p 127.0.0.1:80:80 ghcr.io/luketainton/hesk:latest`.
+4. Open your web browser to http://127.0.0.1/install (change IP/hostname for what you used in the last step).
+5. Follow the instructions to install your HESK instance.

docker-compose.example.yml

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+---
+version: "3"
+services:
+  db:
+    image: mariadb:10.7
+    volumes:
+      - db_data:/var/lib/mysql
+    restart: always
+    environment:
+      MARIADB_RANDOM_ROOT_PASSWORD: yes
+      MARIADB_DATABASE: hesk
+      MARIADB_USER: hesk
+      # Please change the password before deploying.
+      MARIADB_PASSWORD: hesk
+    
+  wordpress:
+    depends_on:
+      - db
+    image: ghcr.io/luketainton/hesk:latest
+    ports:
+      - "80:80"
+    restart: always
+volumes:
+  db_data: {}
+...