feat: append comment to the Response element

[wsabol]

Fixes #796
Closes #796

Fixes

This PR allows you to append a xml comment to a VoiceResponse object.

Checklist

• I acknowledge that all my contributions will be made under the project's license
• I have made a material change to the repo (functionality, testing, spelling, grammar)
• I have read the Contribution Guidelines and my PR follows them
• I have titled the PR appropriately
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• I have added tests that prove my fix is effective or that my feature works
• I have added the necessary documentation about the functionality in the appropriate .md file
• I have added inline documentation to the code I modified

[tiwarishubham635]

Hi @wsabol! I am taking a look at it

[tiwarishubham635]

I can see the files VoiceResponse and Comment should be autogenerated from our internal tool yoyodyne as you can see the lines here. I will check what changes need to be done there for this. Thanks!

[tiwarishubham635]

Created an internal ticket for this