Added the roadmap

roadmap/features/13-default-algorithm-selection.md

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+# Feature: Default Algorithm Selection
+
+## Overview
+
+Smart defaults based on problem characteristics
+
+## Why This Feature Matters
+
+(To be detailed)
+
+## Dependencies
+
+(To be detailed)
+
+## Implementation Approach
+
+(To be detailed)
+
+## Implementation Tasks
+
+- [ ] Core implementation
+- [ ] Integration with existing code
+- [ ] Testing
+- [ ] Documentation
+- [ ] Benchmarking
+
+## Testing Requirements
+
+(To be detailed)
+
+## References
+
+1. Julia implementation: OrdinaryDiffEq.jl
+2. (Additional references to be added)
+
+## Complexity Estimate
+
+**Effort**: Medium
+
+**Risk**: (To be assessed)
+
+## Success Criteria
+
+- [ ] Implementation complete
+- [ ] Tests pass
+- [ ] Documentation written
+- [ ] Performance acceptable
+
+## Future Enhancements
+
+(To be identified)