Import CAD projects and cad-router v1

SimpleCADAPI/docs/api/SemanticDelta.md

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+# SemanticDelta
+
+## Class Definition
+
+```python
+class SemanticDelta(created: Tuple[SemanticRef, ...] = (), modified: Tuple[SemanticRef, ...] = (), deleted: Tuple[SemanticRef, ...] = (), metadata: Dict[str, Any] = field(default_factory=dict))
+```
+
+*Source: topology.py*
+
+## Import Surface
+
+- top-level: `from simplecadapi import SemanticDelta`
+
+## Description
+
+Semantic entity change set attached to a single recorded operation.