Add APKLab for Android

[fujiokayu]

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 #2158 .

Feel free to correct my English when it is wrong.

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The Tool APKLab also provides an automated solution for the Patching, Repackaging, and Re-Signing section.

However, I have not added it here for the following reasons:

• VScode is required as the execution environment.
• This section should provide more primitive knowledge.

[cpholguera]

@fujiokayu I've included some suggestions to compact the text a little bit. Please feel free to apply them by clicking on "Commit suggestion" or start a discussion in the comments. Thank you very much for taking the time to test the tool and writing the PR!

[fujiokayu]

Thanks @cpholguera for checking this PR.
I agree with all your suggestions. Fixed them.

[cpholguera]

Thanks a lot @fujiokayu!