feat(docs): add alternative installation methods to README

[crStiv]

📝 Description

Added "Get Started" section to the README with alternative installation methods beyond Homebrew:

• Building from source with complete step-by-step instructions
• Using pre-built binaries from GitHub releases with platform-specific commands
• Maintained consistent style with the existing documentation

✅ Solved Issues

Resolves #62

🔄 Change

• ✨ New feature (e.g. API route, major perf improvement...)
• 🐛 Bug fix
• 🧹 Chore (e.g. package upgrades, configuration change, refactor, small perf improvement, typos...)
• 🧪 Tests
• 🏭 DevOps (e.g. CI-CD, development environment upgrade, security upgrade, automation addition...)
• 📚 Documentation

• 💥 Breaking Change

💥 Breaking Change (if applicable)

📋 Checklist

• I have added tests to cover my changes, if applicable.
• I have updated relevant documentation for my changes.
• I have included references to issues resolved by this Pull Request
• I have set a Pull Request title that respects gitmoji
• I have set a Pull Request's label to one of type.feat,type.fix,type.chore,type.test,type.docs,type.devops
• I have set a Pull Request's label to one of breaking-change or non-breaking-change
• I have documented breaking changes and migration path, if applicable

📓 Additional Notes