docs: add SETUP.MD

[giuliastf]

Adds a top-level SETUP.MD documenting how to provision a clean development environment for uipath-runtime, run the build, execute the tests, and validate a sample code change.

The file includes:

• Prerequisites and supported platforms (Linux/Windows/macOS via uv)
• Setup, Verify Setup, Build, and Test commands
• A prescribed sample code change (UiPathRuntimeFactoryRegistry.count) with unit tests
• An end-to-end "Test with a real UiPath Coded Agent" flow showing how to validate changes against a real cloud deployment

Same shape as the recently merged equivalent on uipath-mcp-python (UiPath/uipath-mcp-python#217).

[Copilot]

Pull request overview

Adds a top-level developer setup guide (SETUP.MD) for the uipath-runtime Python package, intended to help contributors provision a clean environment with uv, run tests, and validate a sample change end-to-end (including a downstream “real agent” validation flow).

Changes:

• Introduces SETUP.MD with prerequisites, setup/verify steps, and test commands.
• Documents a sample code change + unit-test workflow for UiPathRuntimeFactoryRegistry.
• Describes an optional dev-build/Test PyPI and downstream agent validation process.

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud