Creating a new empty branch for a new project

You can create a branch as an orphan:

git checkout --orphan <branchname>

This will create a new branch with no parents. Then, you can clear the working directory with:

git rm --cached -r .

and add the documentation files, commit them and push them up to github.

A pull or fetch will always update the local information about all the remote branches. If you only want to pull/fetch the information for a single remote branch, you need to specify it.

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