refactored FineList to have Node in seperate file

Assignment_2/Node.cpp

@@ -0,0 +1,17 @@
+#include <mutex>
+
+class Node { 
+public: 
+    int data; 
+    Node* next;
+    std::mutex mut; 
+    public:
+        void lock();
+        void unlock();
+};
+void Node::lock() {
+    this->mut.lock();
+} 
+void Node::unlock() {
+    this->mut.unlock();
+}