Add C example for recursion (#41)

03_recursion/c/03_factorial.c

@@ -0,0 +1,15 @@
+#include <stdio.h>
+
+int fact(int x) {
+	if (x == 1)
+		return 1;
+	else
+		return x * fact(x - 1);
+}
+
+int main(void) {
+	
+	printf("%d", fact(5));
+
+	return 0;
+}