distro-files: add hello world C and C++ programs

distro-files/root/hello.c

@@ -0,0 +1,5 @@
+#include <stdio.h>
+
+int main(){
+	printf("Hello, world!\n");
+}

distro-files/root/hello.cpp

@@ -0,0 +1,6 @@
+#include <iostream>
+
+int main(){
+	std::cout << "Hello, world!" << std::endl;
+	return 0;
+}