The point of this project is to enable signing up for tilde.town via an ssh connection.

It ought to work something like this:

```bash

ssh signup@tilde.town

       <ascii art>

       tilde.town


a creature stands before you. what does it look like?

  > a floating gray cube
    a calico cat with softly glowing eyes
    a squid
    something else

cube: you'd like to sign up for tilde.town, yes?

 > yeah
   nah
   why should I?

you say, "yeah"

cube: by what name should i call you?

  ~cowcow________

cube: unfortunately, i already know someone by that name. what else can i call you?

  ~shelf_________

cube: excellent, hello ~shelf. have you been invited here by anyone i know?

 > yes, i have an invite code
   no

you say "yes, i have an invite code"

cube: great. please paste it and press enter:

  _____________

```

...and so on. 

TODO

- [ ] make signup user
- [ ] get dummy program to run as ssh handler
- [ ] tcell bootstrapping some kind of interactivity
- [ ] existing username check
- [ ] email validation
- [ ] collect responses
- [ ] create the signup request (on disk? db?)
- [ ] invite system support