Minor difference of `Ctrl+F5` from running a C++ program.

[crlf0710]

C++ program Ctrl+F5 has a very useful behavior that it finishes the program and doesn't exit immediately. Instead it outputs the exit code and waits on the user to press a key to quit.

Currently Rust programs using this extension exit immediately when finishes running with Ctrl+F5.

I know nothing about how the Ctrl+F5 suppose to work nor any internals of visual studio extensions, but it would be really helpful if people could give some informative pointers so this behavior could be modified to work like C++ programs