Closes #6

Introduced changes

Create a physical engine in cairo, inspired from https://github.com/johnBuffer/VerletSFML/blob/main/solver.hpp

Next steps

• Use it in a WASM version to validate by observation

Checklist

• Linked relevant issue
• Updated relevant documentation
• Added relevant tests
• Add a dedicated CI job for new examples
• Performed self-review of the code

Workload ~ 3 days