add docker

Dockerfile

@@ -0,0 +1,3 @@
+FROM node:4-onbuild
+# replace this with your application's default port
+EXPOSE 7777

docker-compose.yml

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+version: '2'
+services:
+  web:
+    build: .
+    env_file: .env
+    ports:
+     - "7777:7777"
+    volumes:
+      - ".:/usr/src/app"
+    command: "yarn run start:dev"