Add entry to faq.md about terminal sanity

In other words after running a curses program (ANSI escape codes can
also cause problems) the terminal can be quite insane; echo might be
disabled as a simpler example but many worse more annoying problems can
occur.

The simplest way is to run reset. This will restore everything though
it'll clear the screen (clear command will not fix any problems but just
clear the screen). For echo disabled stty echo should work. Sometimes
you can get away with doing stty sane.

Now these are in the faq.md. I wrote more about this in 2020/ferguson1
but that doesn't really matter other than it was the inspiration for
this entry (which I think is a good idea to include).

faq.md

@@ -172,6 +172,12 @@ fix. If it is accepted we'll be happy to credit you in the entry's _README.md_
 file. If you're a previous winner we will happily link to your entries; if
 you're not we can link to your website if you wish.
 
+## Q: After running a program my terminal is all messed up! How do I restore my terminal?
+
+The simplest way to do this is to type `reset`. If echo was disabled you can get
+away with `stty echo`. Sometimes you can also get away with `stty sane`. `reset`
+does the most but note that it will clear the screen (`clear` will not work).
+
 ## Q: Are there types of entries that are submitted so frequently that the judges get tired of them?
 
 Yes, there are types of entries that show up over and over again.