add repo to github

addgithub.md

mnelson:myproject mnelson$ git remote add origin https://github.com/cubeton/mynewrepository.git
mnelson:myproject mnelson$ git push -u origin master
Counting objects: 3, done.
Writing objects: 100% (3/3), 263 bytes | 0 bytes/s, done.
Total 3 (delta 0), reused 0 (delta 0)
To https://github.com/cubeton/mynewrepository.git
 * [new branch]      master -> master
Branch master set up to track remote branch master from origin.

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Hi, I came here from https://product.hubspot.com/blog/git-and-github-tutorial-for-beginners
I feel like you've done that classic thing here that always happens with tech tutorials. Steps 1-5 are really clear and everything makes sense: the description of what is happening matches up exactly with the code examples and it's all super-simple. Then we get to this step, step 6, and suddenly we've got a "git remote add origin" command that is not described in the text and it's not clear where this command comes from or what 'origin' means. Followed by "git push -u origin master" which is also not really explained.
It suddenly goes up a gear and this is how people like me get left behind with tutorials and end up feeling despondent.