Add GitHub annoyances

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+# GitHub annoyances
+
+## The repository creation wizard can be confusing initially
+
+When creating a new repo, GitHub offers you to populate the repository with some files (a README, a `.gitignore` file, a license).
+
+In some situations, you have an existing directory in your computer with files that you want to be the initial contents of the repo.
+If you create a truly empty repo, then GitHub displays some instructions that can help pushing the contents of your existing directory to the new repo.
+If you use the GitHub features to populate the repo, then GitHub does not display these instructions and uploading your files requires more knowledge.