Move the test apps to a subdirectory

hello/hello.cpp

@@ -0,0 +1,19 @@
+#include <iostream>
+
+class Hello {
+public:
+	Hello() {
+		printf("Hello ctor\n");
+	}
+	~Hello() {
+		printf("Hello dtor\n");
+	}
+};
+
+Hello global_h;
+
+int main(int argc, char* argv[]) {
+	std::cout<<"Hello world C++"<<std::endl;
+	return 0;
+}
+