add arraylist + demo

c_os/user/lib/ArrayList.cc

@@ -0,0 +1,22 @@
+#include "user/lib/ArrayList.h"
+#include "kernel/Globals.h"
+#include "kernel/threads/Thread.h"
+
+// NOTE: Implement this here as we need to include globals for printing
+
+template<typename T>
+void ArrayList<T>::print() const {
+    if (this->buffer_pos == 0) {
+        kout << "Print List (0 elements)" << endl;
+        return;
+    }
+
+    kout << "Print List (" << dec << this->buffer_pos << " elements): ";
+    for (unsigned int i = 0; i < this->buffer_pos; ++i) {
+        kout << dec << this->get(i) << " ";
+    }
+    kout << endl;
+}
+
+template class ArrayList<int>;
+template class ArrayList<Thread*>;