Add game instructions to readme for those new to godot

[cstavitsky]

• Not everyone who needs to run the demo will be familiar with Godot. This PR updates the README with screenshots explaining how to run it for the first time.

[Copilot]

Pull Request Overview

This PR adds comprehensive step-by-step instructions to the README to help users unfamiliar with Godot run the Sentry Jump demo game. The documentation includes visual guides with screenshots to make the process accessible to newcomers.

• Adds detailed "Getting Started" section with prerequisites and step-by-step instructions
• Includes five screenshots showing the Godot project import and launch process
• Provides game controls, objectives, and troubleshooting guidance

Reviewed Changes

Copilot reviewed 6 out of 11 changed files in this pull request and generated 1 comment.

File	Description
README.md	Adds comprehensive getting started guide with screenshots, game controls, and troubleshooting
screenshots/*.png.import	Godot-generated import files for the five new screenshot images used in documentation

Comments suppressed due to low confidence (1)

README.md:13

• Godot 4.5-dev4 appears to be a development snapshot version. Consider referencing a stable release version instead, as development snapshots may become unavailable or change over time.

- Download and install [Godot 4.5-dev4](https://godotengine.org/article/dev-snapshot-godot-4-5-dev-4/) or newer for your operating system

[Copilot]

The --automate flag is not documented or explained. This appears to be a custom or undocumented flag that may confuse users. Consider providing more context about what this flag does or using documented command-line options.

[cstavitsky]

Closing in favor of #2