Update README.md

Author: visiont3lab

Diff for: README.md

@@ -19,3 +19,7 @@ https://drive.google.com/file/d/1bBBn2hO_hIra2fM_YsvV8FRtOGbgHKFq/view?usp=shari
 10. (02/05/2022)DG 3 ore: Tips + Boston Regression : [![Open In Colab](https://colab.research.google.com/assets/colab-badge.svg)](https://colab.research.google.com/github/visiont3lab/machine-learning-course/blob/main/python/42_solut_tips.ipynb), [![Open In Colab](https://colab.research.google.com/assets/colab-badge.svg)](https://colab.research.google.com/github/visiont3lab/machine-learning-course/blob/main/python/50_boston_housing.ipynb)
 11. (09/05/2022) MR 3 ore:  Support Vector Machine [![Open In Colab](https://colab.research.google.com/assets/colab-badge.svg)](https://colab.research.google.com/github/visiont3lab/machine-learning-course/blob/main/classification/SVM.ipynb) +  https://github.com/visiont3lab/mask-detector-covid
 [Haar Cascade Custom Training](https://github.com/visiont3lab/haar-cascade-custom-training)
+
+ DG 3:30 ore:  Decision Tree - ROC AUC  [![Open In Colab](https://colab.research.google.com/assets/colab-badge.svg)](https://colab.research.google.com/github/visiont3lab/machine-learning-course/blob/main/python/59_NAN_NULL.ipynb),
+[![Open In Colab](https://colab.research.google.com/assets/colab-badge.svg)](https://colab.research.google.com/github/visiont3lab/machine-learning-course/blob/main/python/60_DecisionTree.ipynb),[![Open In Colab](https://colab.research.google.com/assets/colab-badge.svg)](https://colab.research.google.com/github/visiont3lab/machine-learning-course/blob/main/python/61_DecisionTrees_Regression.ipynb)
+[PDF_DT](pdf/01_Decision_tree.pdf),[PDF_CONFMATR](pdf/02_Conf_matrix.pdf),[PDF_ROCAUC](pdf/03_AUC_ROC.pdf)