Header Files Addition

[Stable-Dynamics]

Description

Created a header-files.md that goes through what a header file is, why it exists, how it is used , and how it is constructed. Did it as part of the portfolio project on the 'learn GitHub' course on Codecademy. Hopefully it'll be useful :).

Issue Solved

Type of Change

• Adding a new entry

Checklist

• [x ] All writings are my own.
• [ x] My entry follows the Codecademy Docs style guide.
• [ x] My changes generate no new warnings.
• [ x] I have performed a self-review of my own writing and code.
• [ x] I have checked my entry and corrected any misspellings.
• [ x] I have made corresponding changes to the documentation if needed.
• [ x] I have confirmed my changes are not being pushed from my forked main branch.
• [ x] I have confirmed that I'm pushing from a new branch named after the changes I'm making.
• [ x] I have linked any issues that are relevant to this PR in the Issues Solved section.

[CLAassistant]

All committers have signed the CLA.

[PragatiVerma18]

Hey @Stable-Dynamics, thanks for contributing to the docs. Please sign the CLA Agreement from the StableDynamics GitHub username as well; then we can proceed to the first review of this PR.

If you are facing difficulty, please close this PR and open a fresh one from your primary GitHub account. Let me know if you need any help or have any questions about this. Thanks.

[Stable-Dynamics]

Hello @PragatiVerma18, Having a problem getting the other account to work, It was my old Git username before I turned it into an organisation, as such the Stable-Dynamics account is my main one now and when I go to the commit there is no blue ? (as referenced in the CLA Hint Link), all I see when I go to the commit is this:

So I'm not sure exactly what to do from here, any ideas?

EDIT: What I have managed to do though is add the email address used to my main account so it no longer appears in the commit list and only my main account does, is everything ok regarding the CLA now?