boilerplate added with gitignore, cmakelists, and hello world main.cpp

src/main.cpp

@@ -0,0 +1,7 @@
+#include <iostream>
+#include <ostream>
+
+int main(int argc, char *argv[]) {
+  std::cout << "Hello, World" << std::endl;
+  return 0;
+}