add hello world source

add C code for 'hello world'

Signed-off-by: Inho Oh <webispy@gmail.com>

Author: webispy

hello.c

@@ -0,0 +1,8 @@
+#include <stdio.h>
+
+int main(int argc, char *argv[])
+{
+	printf("hello world\n");
+
+	return 0;
+}