README update

README.md

@@ -1,15 +1,18 @@
 # Advance Programming Project - Binary Search Tree
 Buscaroli Elena - Valeriani Lucrezia 
+
 DSSC 2020-2021
 
 # Repository structure
-* c++ 
-  + benchmark 
-    + test.cpp
-  + Makefile
-  + bst.hpp
-  + iterator.hpp
-  + main.cpp
-
-* python
-  + test_exam.py
+* `c++` contains:
+  + `benchmark`
+    + `test.cpp`: the script used to perform the benchmark
+  + `Makefile`: used to compile the main.cpp by typing `make`
+  + `bst.hpp`: header file containing the implementation of the struct node and class bst
+  + `iterator.hpp`: header file containing the implementation of the class _iterator
+  + `main.cpp`: main 
+
+* `python` contains:
+  + `test_exam.py`: python script with the `rd(d)` function implementation and the test code
+
+* `report.pdf`