Add the old instructions

lab1/lex.hh

lab1/main.cc

lab2/Makefile

lab2/Makefile.dependencies

lab2/main.cc

lab2/old_not_used_files/Makefile.OLD

lab2/old_not_used_files/main-old.cc

lab2/scanner.h

lab2/scanner.l

lab2/test/comments

lab2/test/identifiers

lab2/test/numbers

lab3-4/Makefile

lab3-4/Makefile.dependencies

lab3-4/ast.cc

lab3-4/ast.hh

lab3-4/codegen.cc

lab3-4/codegen.hh

lab3-4/function.hh

lab3-4/main.cc