Created dockerfiles for all services and compose file

apollo-gateway/Dockerfile

+FROM node:14
+
+COPY . /opt/app
+
+WORKDIR /opt/app
+
+RUN npm install
+
+EXPOSE 5000
+
+CMD npm start
\ No newline at end of file

comments-service/Dockerfile

+FROM node:14
+
+COPY . /opt/app
+
+WORKDIR /opt/app
+
+RUN npm install
+
+EXPOSE 5003
+
+CMD npm start
\ No newline at end of file

docker-compose.yaml

+version: "3"
+services: 
+  apollo-gateway:
+    build: "./apollo-gateway"
+    depends_on: 
+      - users-service
+      - posts-service
+      - comments-service
+    volumes: 
+      - ./apollo-gateway:/opt/app
+    ports: 
+      - 5000:5000
+
+  users-service:
+    build: "./users-service"
+    volumes: 
+      - ./users-service:/opt/app
+      - /opt/app/node_modules
+    ports: 
+      - 5001:5001
+
+  posts-service:
+    build: "./posts-service"
+    volumes: 
+      - ./posts-service:/opt/app
+    ports: 
+      - 5002:5002
+
+  comments-service:
+    build: "./comments-service"
+    volumes: 
+      - ./comments-service:/opt/app
+    ports: 
+      - 5003:5003
\ No newline at end of file

posts-service/Dockerfile

+FROM node:14
+
+COPY . /opt/app
+
+WORKDIR /opt/app
+
+RUN npm install
+
+EXPOSE 5002
+
+CMD npm start
\ No newline at end of file

users-service/Dockerfile

+FROM node:14
+
+COPY . /opt/app
+
+WORKDIR /opt/app
+
+RUN npm install
+
+EXPOSE 5001
+
+CMD npm start
\ No newline at end of file