Added C++ .gitignore
Added C++ .gitignore

JoshuaKGoldberg/General-Language-Syntax-Compiler-CPlusPlus,JoshuaKGoldberg/General-Language-Syntax-Compiler-CPlusPlus,JoshuaKGoldberg/General-Language-Syntax-Compiler,JoshuaKGoldberg/General-Language-Syntax-Compiler