Add GitHub Action for codespell

[cclauss]

Thank you for submitting a Pull Request to the Mobile Security Testing Guide. Please make sure that:

• Your contribution is written in the 2nd person (e.g. you)
• Your contribution is written in an active present form for as much as possible.
• You have made sure that the reference section is up to date (e.g. please add sources you have used, make sure that the references to MITRE/MASVS/etc. are up to date)
• Your contribution has proper formatted markdown and/or code
• Any references to website have been formatted as [TEXT](URL “NAME”)
• You verified/tested the effectiveness of your contribution (e.g.: is the code really an effective remediation? Please verify it works!)

If your PR is related to an issue. Please end your PR test with the following line:
This PR closes #< insert number here >.

[cclauss]

@cpholguera

[cpholguera]

@cclauss this is excellent! Please, if you have any other ideas for quality improvement (or anything else) keep them coming as PRs or post them to our GitHub Discussions. Thank you very much!