mongo: Add page (#994)

* mongo: Add page

* Addressing comments

pages/common/mongo.md

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+# mongo
+
+> MongoDB interactive shell client.
+
+- Connect to a database:
+
+`mongo {{database}}`
+
+- Connect to a database running on a given host on a given port:
+
+`mongo --host {{host}} --port {{port}} {{database}}`
+
+- Connect to a database with a given username; user will be prompted for password:
+
+`mongo --username {{username}} {{database}} --password`
+
+- Evaluate a javascript expression on the database:
+
+`mongo --eval '{{JSON.stringify(db.foo.findOne())}}' {{database}}`