Add Docker files, Update rails commands

docker-compose.yml

@@ -0,0 +1,24 @@
+version: "2"
+
+volumes:
+  mysql:
+
+services:
+  app:
+    build:
+      context: ./
+      dockerfile: Dockerfile.development
+    command: rails server --bind 0.0.0.0
+    volumes:
+      - ./:/srv/app
+    ports:
+      - 3000:3000
+    depends_on:
+      - mysql
+
+  mysql:
+    image: mariadb:10.1
+    volumes:
+      - mysql:/var/lib/mysql
+    environment:
+      MYSQL_ROOT_PASSWORD: secret