Create README.md
Update README.md
first import
add new lecture + gitignore
adding new directory for class sheets
add gitignore
adding new class on C++ features
new class on C++ class
remove twoside and add new classes
change class name
Fix Stroustrup's name
add mention of -Wall option
Clarify explanation of #if directive
add reference in bibliography
Add precision concerning references
Fix code examples
Fix typos
Clarify some things in td_classes
Clarify things in td_nombre_aleatoire
Fix typos