Add base code

os/main.c

@@ -0,0 +1,17 @@
+#include "process.h"
+#include "scheduler.h"
+#include "alloc.h"
+
+extern int task1(void);
+extern int task2(void);
+
+int main(void) {
+    init_allocator();
+    ProcessTable *ptable;
+    create_process_table(&ptable);
+
+    create_process(ptable, task1);
+    create_process(ptable, task2);
+
+    run(ptable);
+}