docs(Contributions):added the parameters and guides for contributions to be followed in this org.

[Viscous106]

This pull request adds a comprehensive CONTRIBUTING guide for Crown-OS, centralizing contribution standards and workflows for all repositories in the organization. The guide covers maintainer roles, branching and commit conventions, PR process, code standards for each language, and other essential policies to ensure high-quality, consistent contributions.

Key additions:

Contribution workflow and standards:

• Introduces a step-by-step quickstart for contributing, including forking, branching, committing, rebasing, and PR submission.
• Details branch naming conventions and enforces Conventional Commits 1.0 for all commits, with clear tables for types and scopes.
• Outlines the PR process, including required issue linkage, review requirements, and rebase-only merge policy.

Project structure and code quality:

• Documents the multi-repo architecture of Crown-OS and the primary language and purpose of each repository.
• Specifies code formatting, linting, and testing standards for Rust, TypeScript/Solid.js, Kotlin, and shell scripts, including required tools and commands.

Governance and policies:

• Lists core maintainers and their approval role, and formalizes DCO sign-off and the adoption of the Contributor Covenant Code of Conduct. (F97f4ee3R