Tutorial: Rewrite using conventions enabled by CMake 3.23

This is a full re-write of the CMake Tutorial for CMake 3.23, both
the functionality it provides, as well as the modern workflows that
developers use when interfacing with CMake.

Issue: #22663, #23086, #23799, #26053, #26105, #26153, #26914

Help/guide/tutorial/Step3/Tutorial/Tutorial.cxx

@@ -0,0 +1,26 @@
+// A simple program that computes the square root of a number
+
+// TODO3: Include <format>
+
+#include <iostream>
+#include <string>
+
+#include <MathFunctions.h>
+
+int main(int argc, char* argv[])
+{
+  if (argc < 2) {
+    // TODO4: Convert the print to use std::format
+    std::cout << "Usage: " << argv[0] << " number" << std::endl;
+    return 1;
+  }
+
+  // convert input to double
+  double const inputValue = std::stod(argv[1]);
+
+  // calculate square root
+  double const outputValue = mathfunctions::sqrt(inputValue);
+  // TODO5: Convert the print to use std::format
+  std::cout << "The square root of " << inputValue << " is " << outputValue
+            << std::endl;
+}