:circus_tent: Added .gitattributes & .gitignore files
knn and LDA and QDA

I've tested GridSearchCV to determine the best number of features to
select in RFE and the best k in KNN.
I've tested KNN and LDA and QDA but some problem occurred in QDA
J'ai testé :
GridSearchCV pour déterminer k et nb_features_to_select
KNN
LDA
QDA