feat: setup allcontributors configuration, badge, and documentation

[utkarsh232005]

This PR sets up All Contributors configuration, adds the contributors badge and placeholder list to the README.md, and documents contribution steps in CONTRIBUTING.md.

[coderabbitai]

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⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: ASSERTIVE

Plan: Pro Plus

Run ID: 895e87bb-306c-41e2-8b4f-635aa2731b26

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Note

.coderabbit.yaml has unrecognized properties

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⚠️ Parsing warnings (1)

Validation error: Unrecognized key: "pre_merge_checks"

⚙️ Configuration instructions

• Please see the configuration documentation for more information.
• You can also validate your configuration using the online YAML validator.
• If your editor has YAML language server enabled, you can add the path at the top of this file to enable auto-completion and validation: # yaml-language-server: $schema=https://coderabbit.ai/integrations/schema.v2.json

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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