add: qr scanner and generator

[singodiyashubham87]

Title and Issue number

Title : QR Scanner and Generator

Issue No. : #249

Code Stack : HTML, CSS, JS

Close #

Checklist:

• [x] I have mentioned the issue number in my Pull Request.
• [x] I have commented my code, particularly in hard-to-understand areas
• [x] I have updated the Index.html file for my contribution

[netlify[bot]]

✅ Deploy Preview for preeminent-tapioca-4294b2 ready!

Name	Link
🔨 Latest commit	0ef31f4d6e5d7928ddc142c551acfddaf8938d75
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😎 Deploy Preview	https://deploy-preview-258--preeminent-tapioca-4294b2.netlify.app/machine-coding/qr-scanner-and-generator
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

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[singodiyashubham87]

@sadanandpai Have a look now.

[sadanandpai]

Please address all the comments

[singodiyashubham87]

@sadanandpai Done!

[sadanandpai]

@singodiyashubham87 plz address all the comments