Add the old instructions

lab3-4/old_not_used_files/Makefile.OLD

lab3-4/old_not_used_files/codegen.cc.OLD

lab3-4/old_not_used_files/parser.y.OLD

lab3-4/parser.y

lab3-4/scanner.l

lab3-4/string.cc

lab3-4/string.hh

lab3-4/symtab.cc

lab3-4/symtab.hh

lab3-4/test/test

lab3-4/test/test.OLD

old_not_used_files/lab3-4_old/Makefile

old_not_used_files/lab3-4_old/Makefile.OLD

old_not_used_files/lab3-4_old/Makefile.dependencies

old_not_used_files/lab3-4_old/ast.cc

old_not_used_files/lab3-4_old/ast.hh

old_not_used_files/lab3-4_old/codegen.cc

old_not_used_files/lab3-4_old/codegen.cc.OLD

old_not_used_files/lab3-4_old/codegen.hh

old_not_used_files/lab3-4_old/function.hh