add yaml example

examples/yaml/CMakeLists.txt

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+cmake_minimum_required(VERSION 3.14 FATAL_ERROR)
+
+# ---- Dependencies ----
+
+include(../../cmake/CPM.cmake)
+
+CPMAddPackage(
+  NAME yaml-cpp
+  GIT_REPOSITORY https://github.com/jbeder/yaml-cpp.git
+  # 0.6.2 uses old CMake syntax
+  VERSION 0.6.3                                  
+  # 0.6.3 not released yet  
+  GIT_TAG 012269756149ae99745b6dafefd415843d7420bb 
+  OPTIONS
+    "YAML_CPP_BUILD_TESTS Off"
+    "YAML_CPP_BUILD_CONTRIB On"
+    "YAML_CPP_BUILD_TOOLS On"    
+)
+
+# ---- Executable ----
+
+add_executable(CPMYamlExample "main.cpp")
+set_target_properties(CPMYamlExample PROPERTIES CXX_STANDARD 17)        
+target_link_libraries(CPMYamlExample yaml-cpp)
+

examples/yaml/main.cpp

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+#include <yaml-cpp/yaml.h>
+#include <iostream>
+
+int main(int argc, char ** argv){
+  if (argc != 2) {
+    std::cout << "usage: " << argv[0] << " <path to yaml file>" << std::endl;
+    return 1;
+  }
+
+  YAML::Node config = YAML::LoadFile(argv[1]);
+  std::cout << "Parsed YAML:\n" << config << std::endl;
+
+  return 0;
+}

examples/yaml/monsters.yaml

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+- name: Ogre
+  position: [0, 5, 0]
+  powers:
+    - name: Club
+      damage: 10
+    - name: Fist
+      damage: 8
+- name: Dragon
+  position: [1, 0, 10]
+  powers:
+    - name: Fire Breath
+      damage: 25
+    - name: Claws
+      damage: 15
+- name: Wizard
+  position: [5, -3, 0]
+  powers:
+    - name: Acid Rain
+      damage: 50
+    - name: Staff
+      damage: 3