Added a section encouraging users to star the repository on GitHub, including a badge and supporting text to help promote the project.

Introduced 'Share this project' section in the README with buttons for sharing on X (Twitter) and Reddit to increase project visibility.

Introduced CONTRIBUTING.md, bug report and feature request issue templates, and a pull request template to standardize contributions, issue reporting, and PR submissions. These additions aim to improve project collaboration, clarify contribution guidelines, and streamline the review process.

Introduces a new Personal Access Token source for OAuth2 authentication, supporting both classic and fine-grained tokens. Updates the README with usage instructions and security notes. Adds comprehensive tests for the new token source functionality.

Introduces a cleanHTTPClient function for better HTTP client defaults and connection pooling. Updates NewInstallationTokenSource to use the new HTTP client and wraps the installationTokenSource with oauth2.ReuseTokenSource for improved token reuse.

Added changelog and README updates for v1.4.0, highlighting new personal access token support, advanced token caching, high-performance HTTP client, and significant performance optimizations. Documentation now reflects new features and improvements for production readiness and efficiency.

feat: Add support for GitHub personal access tokens