chore: add GOVERNANCE.md for open source

Ticket: WP-5840

Author: pranavjain97

GOVERNANCE.md

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+# Advanced Wallets Governance Model
+
+## 1. Introduction
+
+This document defines the governance model for the BitGo Advanced Wallets open source project. It outlines the roles, rules for participation, and decision-making processes to ensure the project remains secure and transparent.
+
+## 2. Project Goals and Values
+
+The decision to open source this project is driven by several key objectives, all rooted in transparency, security, and community benefit.
+
+- **Security and Audits**: The primary goal is to enable the community to perform security audits. Open-sourcing all components provides full transparency and an auditable history of the codebase, which is critical for identifying vulnerabilities and ensuring a high level of security.
+
+- **On-Premise Adoption**: We aim to promote the adoption of on-premise hot wallet setups. This project serves as a toolkit and example for users and services to integrate their own Hardware Security Modules (HSMs) or Key Management Systems (KMSs) for user and backup key management.
+
+## 3. Roles and Responsibilities
+
+### Contributors
+
+Any individual or organization can become a contributor. Contributors can submit code, documentation, and other changes through pull requests. The ability to contribute is open to everyone, regardless of their affiliation.
+
+### Maintainers
+
+The maintainers are individuals designated to review and approve contributions. They are responsible for ensuring the quality, security, and integrity of the project's codebase. For this project, a Maintainer is a member of the core BitGo team.
+
+## 4. Contribution and Review Process
+
+- All contributions must be submitted via a pull request to the main repository.
+- A contribution is considered ready for merging only after it has been reviewed and approved by **at least two designated Maintainers**.
+- The Maintainers will review the contribution for correctness, security implications, code quality, and alignment with the project's goals.
+- Contributors are expected to be responsive to feedback from Maintainers to ensure a smooth review process.
+
+## 5. Decision Making
+
+### Consensus-Based for Core Changes
+
+For significant changes to the project's architecture, roadmap, or governance, Maintainers will work toward a consensus.
+
+### Maintainer Discretion
+
+For standard pull requests, the final decision to merge rests with the Maintainers. Their role is to uphold the security and quality standards of the project.
+
+## 6. Communication
+
+- **GitHub Issues**: All bugs, feature requests, and technical discussions should be held on the project's GitHub issues page to ensure transparency and a public record.
+
+- **Pull Request Comments**: All feedback and discussions related to specific code changes should take place directly on the pull request.
+
+- **Support**: For general support, reach out to [[email protected]](mailto:[email protected]).