New examples (#47)

* simplify yaml build

* add simple_match

examples/simple_match/main.cpp

@@ -0,0 +1,34 @@
+#include <simple_match/simple_match.hpp>
+
+#include <iostream>
+
+int main(int argc, char ** argv){
+  using namespace simple_match;
+  using namespace simple_match::placeholders;
+
+  std::string input;
+  std::cout << "please enter a number or 'quit' to exit" << std::endl;
+
+  while (true) {
+    std::cout << "> ";
+    std::getline(std::cin, input);
+    if (input == "quit") { break; }
+    int x;
+    try {
+      x = std::stoi(input);
+    } catch(std::invalid_argument &) {
+      std::cout << "invalid input" << std::endl;
+      continue;
+    }
+    
+    match(x,
+      1, []() {std::cout << "The answer is one\n"; },
+      2, []() {std::cout << "The answer is two\n"; },
+      _x < 10, [](auto&& a) {std::cout << "The answer " << a << " is less than 10\n"; },
+      10 < _x < 20,	[](auto&& a) {std::cout << "The answer " << a  << " is between 10 and 20 exclusive\n"; },
+      _, []() {std::cout << "Did not match\n"; }
+    );
+  }
+
+  return 0;
+}