Add MariaDB.

mariadb/README.md

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+# Enter the Container w/ Bash
+
+`docker-compose exec --user root db /bin/bash`
+
+# Enter the MySQL Shell
+
+`docker-compose exec --user root db mysql -u root -p`
+
+When prompted, enter `password` as the password.
+
+# Create a DB
+
+While inside the shell, run the following:
+
+```
+CREATE DATABASE mydatabase;
+```

mariadb/docker-compose.yml

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+version: '3'
+
+services: 
+  db:
+    image: mariadb:latest
+    volumes:
+      - dbdata:/var/lib/mysql
+    restart: always
+    ports:
+      - 3306:3306
+    environment:
+      MYSQL_ROOT_PASSWORD: password
+
+volumes:
+  dbdata: