add mongo docker ocmpose

parts/3/.gitignore

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+data/*
+.env

parts/3/docker-compose.yml

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+version: '3'
+
+services:
+    mongo:
+        image: mongo
+        environment:
+            - MONGO_INITDB_ROOT_USERNAME=${MONGO_ROOT_USER}
+            - MONGO_INITDB_ROOT_PASSWORD=${MONGO_ROOT_PASSWORD}
+            - MONGO_INITDB_DATABASE=project
+        ports:
+          - '27017:27017'
+        volumes: 
+          - ./data:/data/db
+    mongo-express:
+        image: mongo-express
+        environment:
+            - ME_CONFIG_MONGODB_SERVER=mongo
+            - ME_CONFIG_MONGODB_PORT=27017
+            - ME_CONFIG_MONGODB_ENABLE_ADMIN=true
+            - ME_CONFIG_MONGODB_AUTH_DATABASE=admin
+            - ME_CONFIG_MONGODB_AUTH_USERNAME=${MONGO_ROOT_USER}
+            - ME_CONFIG_MONGODB_AUTH_PASSWORD=${MONGO_ROOT_PASSWORD}
+            - ME_CONFIG_BASICAUTH_USERNAME=${MONGOEXPRESS_LOGIN}
+            - ME_CONFIG_BASICAUTH_PASSWORD=${MONGOEXPRESS_PASSWORD}
+        depends_on:
+            - mongo
+        ports:
+          - "8888:8081"