Added first pull of external repo and README addition on external content

Signed-off-by: Tobias Babin <[email protected]>

Author: TobiasBabin

README.md

@@ -93,6 +93,25 @@ Example output.
 
 To lint all documents, run `yarn lint`.
 
+## Autogenerated content
+
+### Score example hub
+
+This site uses content from external Git repositories to create and continuously update the "Score example hub" pages. The external repos are pulled in to the `/gen/external-repos` folder.
+
+The commands for the initial integration of an external repo are:
+
+```bash
+git remote add -f repo-name https://github.com/repo-org/repo-name.git
+git subtree add --prefix gen/external-repos/repo-name/ repo-name main --squash
+```
+
+These commands will not have to be repeated unless re-creating the repo integration, or moving the source location. In that case, remove the `remote`, delete the local contents, repeat these commands targeting the new location, and update the generation scripts.
+
+### Pulling new content
+
+TODO - fill in the details on the continous pulling of external content once implemented.
+
 ## Troubleshooting documentation site builds
 
 This section covers common build issues with Hugo.