Added koel config

koel/.env.example

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+# Database Settings
+DB_USERNAME=koel
+DB_PASSWORD=changeme
+DB_ROOT_PASSWORD=changeme

koel/README.md

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+# Koel
+[Koel](https://github.com/koel/koel) is a self-hostable music server.
+
+# Initial setup
+After launching the application for the first time, you have to run the initial
+setup. This can be done using the following command:
+
+```
+docker exec -it koel_app_1 php artisan koel:init
+```
+
+This will ask you to configure the admin user etc. The location for the music
+can be left as the default (`/music`). The command will error out after asking
+this; this is normal. Even though an error occurred, the system still
+initialized successfully.

koel/docker-compose.yml

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+version: '3.5'
+
+services:
+    app:
+        image: 'hyzual/koel:latest'
+        restart: 'always'
+
+        depends_on:
+            - 'db'
+        environment:
+            - 'DB_CONNECTION=mysql'
+            - 'DB_DATABASE=koel'
+            - 'DB_HOST=db'
+            - 'DB_PASSWORD'
+            - 'DB_USERNAME'
+        labels:
+            - 'com.centurylinklabs.watchtower.enable=true'
+        networks:
+            - 'default'
+            - 'nginx'
+        volumes:
+            - 'config:/var/www/html'
+            - 'covers:/var/www/html/public/img/covers'
+            - 'music:/music'
+    
+    db:
+        image: 'mysql:8'
+        restart: 'always'
+        command: '--default-authentication-plugin=mysql_native_password'
+
+        environment:
+            - 'MYSQL_DATABASE=koel'
+            - 'MYSQL_PASSWORD=$DB_PASSWORD'
+            - 'MYSQL_ROOT_PASSWORD=$DB_ROOT_PASSWORD'
+            - 'MYSQL_USER=$DB_USERNAME'
+        labels:
+            - 'com.centurylinklabs.watchtower.enable=true'
+        volumes:
+            - 'db-data:/var/lib/mysql'
+
+networks:
+    nginx:
+        external: true
+
+volumes:
+    config:
+    covers:
+    db-data:
+    music: