adding memory example

lectures/06_memory/memory.cpp

@@ -0,0 +1,25 @@
+#include <iostream>
+
+void func1() {
+    int a = 42;
+    std::cout << "a: " << a << std::endl;
+}
+
+void func2() {
+    int* b = new int(42);  
+    std::cout << "b: " << *b << std::endl;
+    delete b;
+}
+
+int c = 42;
+static int d = 42;
+
+int main() {
+    func1();
+    func2();
+
+    std::cout << "c: " << c << std::endl;
+    std::cout << "d: " << d << std::endl;
+
+    return 0;
+}