added password constraints

[meenakshi3151]

Changes made to the project

I have added the necessary password constraints like minimum characters should be 8 with at least 1 lower case character , 1 uppercase character , 1 number and special symbols using validator node module.

Related Issue

Fixes #3

Type of change

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] This change requires a documentation update

Motivation and Context

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration

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Checklist:

• [x] I have registered myself at Contrihub website.
• [x] My code follows the code style of this project.
• [ ] I have commented my code, particularly in hard-to-understand areas
• [x] My changes generate no new warnings
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [x] I have read the CONTRIBUTING document.
• [ ] Any dependent changes have been merged and published in downstream modules
• [ ] I have added tests to cover my changes.
• [x] All new and existing tests passed.

Test Configuration:

• Firmware version:
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• SDK: