Add missing files

tasks/tasks.c

@@ -0,0 +1,11 @@
+#include "library.h"
+
+int task2(void) {
+    puts("Hello World from task 1\n");
+    return 0;
+}
+
+int task1(void) {
+    puts("Hello World from task 2\n");
+    return 0;
+}