feat(java): ✨ add method to verify header and update documentation

[MakodeAjay]

Closes: #53

Type of changes?

• Bug fixes: Non-breaking change which fixes an issue
• New feature: Non-breaking change which adds a new feature
• Performance improvement: Non-breaking change which improves performance
• Documentation: Non-breaking change which improves documentation
• Other: Non-breaking change which does not fit into the above categories
• Breaking change: A breaking change which requires a new version of the library

Checklist for Java project

• Change not related to Java project

Following checklists are optional if above checkbox is selected:

• Copyright banner comment added to newly added files, except *.md, *.yml, *.json?
• Proper JavaDoc updated in main and test classes for all public classes and methods?
• Tests added for changes?
• Tests are passing locally?
• Check style checks are passing locally?
• Test coverage is at least 80% for newly added changes?
• There are no SonarCloud issues?
• README updated? (if applicable)
• Documentation website updated for the PR raised?

Checklist for Website

• Change not related to Website project

Following is optional if above checkbox is selected:

• Lint check passes locally?
• Prettier check passes locally?
• Build command working fine locally?

Reviewers

@WasiqBhamla/boyka-core

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