Create darwin.md

Author: roicort

docs/src/darwin.md

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+# metazoo.bio.darwin
+
+Contains implementations of animal-inspired algorithms.
+
+## Submodules
+- `pso`: Particle Swarm Optimization
+
+### Example
+```python
+from metazoo.bio.darwin.pso import ParticleSwarmOptimizer
+from metazoo.gym.evolutionary import crossover, mutation, selection
+```
+
+
+# Reference
+
+::: metazoo.bio.darwin