Adding file

docker-compose.yml

+# Adapted from https://hub.docker.com/_/mongo
+# Exposes the MongoDB server to the localhost.
+services:
+    mongo:
+        container_name: mongodb
+        image: mongo
+        restart: always
+        environment:
+            MONGO_INITDB_ROOT_USERNAME: root
+            MONGO_INITDB_ROOT_PASSWORD: example
+        ports:
+            - "27017:27017"
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