Created Helpful Mongo Commands (markdown)

Helpful-Mongo-Commands.md

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+### Join the Mongo Container
+
+On the host machine where all the containers are, run:
+
+`docker exec -i -t $(docker ps -a | grep mongo | awk '{print $1}') /bin/bash`
+
+This will give you a shell inside the mongo container. Start mongo with: `mongo`