Added docker file

Dockerfile

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+FROM node:12.18.1
+ENV NODE_ENV=development
+
+WORKDIR /app
+
+COPY ["package.json", "package-lock.json*", "./"]
+
+RUN npm install
+
+COPY . .
+
+CMD [ "node", "app.js" ]

docker-compose.dev.yml

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+version: '3.8'
+
+services:
+ notes:
+  build:
+   context: .
+  ports:
+   - 8000:8000
+  environment:
+   - SERVER_PORT=8000
+   - DATABASE_CONNECTIONSTRING=mongodb://localhost:27017/snake-game
+  volumes:
+   - ./:/code
+  command: node app.js
+
+ mongo:
+  image: mongo:4.2.8
+  ports:
+   - 27017:27017
+  volumes:
+   - mongodb:/data/db
+   - mongodb_config:/data/configdb
+volumes:
+ mongodb:
+ mongodb_config:

docker-compose.yml

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+version: '3.3'
+
+services:
+ notes:
+  build:
+   context: .
+  ports:
+   - 8000:8000
+  environment:
+   - SERVER_PORT=8000
+   - DATABASE_CONNECTIONSTRING=mongodb://localhost:27017/snake-game
+  volumes:
+   - ./:/code
+  command: node app.js
+
+ mongo:
+  image: mongo:4.2.8
+  ports:
+   - 27017:27017
+  volumes:
+   - mongodb:/data/db
+   - mongodb_config:/data/configdb
+volumes:
+ mongodb:
+ mongodb_config: