Add Determine The Database Version as the first MongoDB til

README.md

@@ -9,7 +9,7 @@ and pairing with smart people at Hashrocket.
 
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-_903 TILs and counting..._
+_904 TILs and counting..._
 
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 * [JavaScript](#javascript)
 * [Linux](#linux)
 * [Mac](#mac)
+* [MongoDB](#mongodb)
 * [MySQL](#mysql)
 * [Phoenix](#phoenix)
 * [PostgreSQL](#postgresql)
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 - [Specify App When Opening From Command Line](mac/specify-app-when-opening-from-command-line.md)
 - [View All Windows Of The Current App](mac/view-all-windows-of-the-current-app.md)
 
+### MongoDB
+
+- [Determine The Database Version](mongodb/determine-the-database-version.md)
+
 ### MySQL
 
 - [Display Output In A Vertical Format](mysql/display-output-in-a-vertical-format.md)

mongodb/determine-the-database-version.md

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+# Determine The Database Version
+
+Whether your Mongo database is local or remote, you should connect to it using
+the [`mongo` CLI](https://docs.mongodb.com/manual/mongo/).
+
+Once connected, you can issue the following query:
+
+```
+db.version()
+```
+
+This will output the version of your Mongo database.
+
+[source](https://docs.mongodb.com/manual/reference/method/db.version/)