adding 100, first.

0x11-singly_linked_lists/100-first.c

@@ -0,0 +1,11 @@
+#include <stdio.h>
+/**
+ * first - prints before main executes.
+ * Return: none.
+ */
+void first(void) __attribute__ ((constructor));
+void first(void)
+{
+	printf("You're beat! and yet, you must allow,\n"
+		"I bore my house upon my back!\n");
+}

0x11-singly_linked_lists/100-main.c

@@ -0,0 +1,12 @@
+#include <stdio.h>
+
+/**
+ * main - check the code for Holberton School students.
+ *
+ * Return: Always 0.
+ */
+int main(void)
+{
+    printf("(A tortoise, having pretty good sense of a hare's nature, challenges one to a race.)\n");
+    return (0);
+}