[Template] Add support for ZX Spectrum emulator

[networkfusion]

Description

This is a template to show others how a new emulator could be added to the menu source code. In this PR we attempt to:
Adds base support for a Sinclair ZX Spectrum emulator (since one is contained within Goldeneye).

Motivation and Context

How Has This Been Tested?

Screenshots

Types of changes

• Improvement (non-breaking change that adds a new feature)
• Bug fix (fixes an issue)
• Breaking change (breaking change)
• Documentation Improvement
• Config and build (change in the configuration and build system, has no impact on code or features)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.

Signed-off-by: GITHUB_USER <GITHUB_USER_EMAIL>

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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