[vue]: add solution for password-strength

[jaydadhaniya]

Title : [Vue]: Add solution for password-strength

Issue No. : 349

Code Stack : VueJs

Close #349

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 created a helpful and easy to understand README.md
• [x] I have updated the Index.html file for my contribution

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[arpansaha13]

Thank you for your contribution!