On your browser go to GitHub and create the new Repo.  On the main page of the repo will be a little box giving you an SSH URL like git@github.com:cisc474/stupid-simple-multi-page-example.git  Copy it to your clipboard

Go to the directory you want to push to github.

Type: git init

(this makes that directory a git maintained directory)

Then type: git remote add origin git@github.com:cisc474/stupid-simple-multi-page-example.git

(Make the URL the one you copied and pasted a bit ok.)

then for each file you want to add type 
git add blah.js
or 
git add *.js
or git add *.*
or git add . (the whole directory you are in)
or git add public (some subdirectory)

git commit -am "First commit"

git push origin master

If it complains about needing to pull then do 
git pull origin master
then maybe save their merge message
then
git push origin master

if it complains about your SSH key then add your SSH key to your github account
followed by the above step (git push origin master)

Refresh your github repo and rejoice

If you don't want to type origin master every time there is a command like '--set-upstream-to' which will make 
git push and git pull automatically head to origin master