docs(changelog): added changelog

CHANGELOG.md

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+## v0.2.1 (2026-03-20)
+
+### Feat
+
+- **tools**: Added winding visualization
+- **src**: Enabled Vacuume Region Generation
+
+### Fix
+
+- **cuviliniear.cpp**: removed unused BSD proc header
+- **stroid**: exit properly after stroid -v
+
+## v0.1.0 (2026-01-31)
+
+### Feat
+
+- **release**: added macos release script
+- **build-check**: added setup checks for stl compatibility
+- **stroid**: improved CLI & fixed gcc bug
+- **stroid**: added command line and tests
+- **stroid**: first working version
+- **stroid**: initial commit
+
+### Fix
+
+- **linux**: fixed linux compilation
+- **build-check**: removed c lang
+
+### Refactor
+
+- **stroid**: changed default mesh format from VTU to MFEM