Initial structure with minimal example

Introduce an initial project structure for writing the Miden VM constraints. This should contain a minimal running example to start from.

The issue is about creating an initial project structure for the Miden VM constraints in the air-script repository. Start by examining the existing codebase to understand the current layout and how constraints are defined. Look for examples or tests related to AIR constraints. The goal is to produce a minimal running example that can serve as a starting point for further development. Ensure the structure aligns with the project's goals for writing STARK proofs.

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