Just to use the issue tracker and agile project management of github
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Once you create an account you will want to FORK a new BRANCH of the repository to allow yourself to make changes.
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These changes will only be made to your BRANCH and will not affect the main repository
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Once you have made the desired changes, you submit a PULL REQUEST that proposes your changes to be included in the main repository
See https://guides.github.com/activities/hello-world/ for additional info