feat: add method parseEnglishDate for English date parsing

[aj3sh]

Description

• Added functionality for parsing English date parseEnglishDate.
• Minor change in previous documentation.
• Updated documentation regarding the parseEnglishDate.
• Added "Quick Date conversion using NepaliDate" in the documentation.

Impacts:

No impacts

Related Issue

Fixes: #78

Type of Change

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• Bug fix
• New feature
• Enhancement
• Documentation update
• Refactor
• Other (please specify)

Checklist

• I have added/updated the necessary documentation on README.md.
• I have added appropriate test cases (if applicable) to ensure the changes are functioning correctly.
• My pull request has a clear title and description.

Additional Notes

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