feat: implement CPP03 C++20 card

src/task03/main.cpp

@@ -0,0 +1,4 @@
+#include <cstddef>
+#include <iostream>
+template <std::size_t N> int sum(const int (&values)[N]) { int result{}; for (int value : values) result += value; return result; }
+int main() { int values[]{2, 4, 6, 8}; std::cout << "count=" << (sizeof(values) / sizeof(values[0])) << " sum=" << sum(values) << '\n'; }