I'm following the instructions on how to add an existing project to GitHub from GitHub docs. However, I get an 'gh' is not recognized as an internal or external command, operable program or batch file. error message when I try to use gh repo create fs1 command in the project root directory as instructed. Here fs1 is my project name. I browsed StackOverflow but couldn't find any help yet. What am I missing?
The page you are following doesn't include the instructions to install the GitHub CLI, so it is likely you don't have it installed (it doesn't come with git as far as I know).
Installation instructions can be found here: https://cli.github.com/