feat: add domain model foundation

tests/core/property_definition_test.cpp

@@ -0,0 +1,25 @@
+#include "fesa/core/PropertyDefinition.hpp"
+
+namespace {
+
+int require(bool condition) {
+    return condition ? 0 : 1;
+}
+
+} // namespace
+
+int run_property_definition_tests() {
+    const fesa::core::ShellPropertyDefinition property{500, 700, 0.01};
+
+    if (const int result = require(property.id() == 500); result != 0) {
+        return result;
+    }
+    if (const int result = require(property.materialId() == 700); result != 0) {
+        return result;
+    }
+    if (const int result = require(property.thickness() == 0.01); result != 0) {
+        return result;
+    }
+
+    return 0;
+}