Started a cmake tutorial

Step1/CMakeLists.txt

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+# TODO 1: Set the minimum required version of CMake to be 3.10
+
+# TODO 2: Create a project named Tutorial
+
+# TODO 7: Set the project version number as 1.0 in the above project command
+
+# TODO 6: Set the variable CMAKE_CXX_STANDARD to 11
+#         and the variable CMAKE_CXX_STANDARD_REQUIRED to True
+
+# TODO 8: Use configure_file to configure and copy TutorialConfig.h.in to
+#         TutorialConfig.h
+
+# TODO 3: Add an executable called Tutorial to the project
+# Hint: Be sure to specify the source file as tutorial.cxx
+
+# TODO 9: Use target_include_directories to include ${PROJECT_BINARY_DIR}

Step1/TutorialConfig.h.in

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+// the configured options and settings for Tutorial
+// TODO 10: Define Tutorial_VERSION_MAJOR and Tutorial_VERSION_MINOR

Step1/tutorial.cxx

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+// A simple program that computes the square root of a number
+#include <cmath>
+#include <cstdlib> // TODO 5: Remove this line
+#include <iostream>
+#include <string>
+
+// TODO 11: Include TutorialConfig.h
+
+int main(int argc, char* argv[])
+{
+  if (argc < 2) {
+    // TODO 12: Create a print statement using Tutorial_VERSION_MAJOR
+    //          and Tutorial_VERSION_MINOR
+    std::cout << "Usage: " << argv[0] << " number" << std::endl;
+    return 1;
+  }
+
+  // convert input to double
+  // TODO 4: Replace atof(argv[1]) with std::stod(argv[1])
+  const double inputValue = atof(argv[1]);
+
+  // calculate square root
+  const double outputValue = sqrt(inputValue);
+  std::cout << "The square root of " << inputValue << " is " << outputValue
+            << std::endl;
+  return 0;
+}