Created Updating from source (markdown)

Updating-from-source.md

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+1. Stop the server
+2. Switch to the source directory
+3. Update your repo:
+    * If running from the main branch, run ```git pull``` to update the repo
+    * If running from another branch or tag, run:
+      * ```git fetch```
+      * ```git checkout <branch or tag name>```
+4. Run steps 12 and 13 from the above Build guide