Add Another System Definition to Arrokoth PR

change the invocation to

```
sbcl --noinform --eval '(asdf:load-system :arrokoth)' --eval '(arrokoth:run)'
```

oops, I accidentally nuked those markdown block backticks. Those feels when merge rejected

I changed however it is the non-asdf load was working to asdf package-inferred-system

(uiop:define-package :arrokoth/arrokoth
    (:import-from :clx)
  (:mix :clim :clim-lisp :arrokoth/marklib :cl)
  (:export run)
  (:nicknames :arrokoth)
  )

(ql:quickload :mcclim)

Tbh I think that (:import-from :clx) should replace (ql:Quickload :mcclim), but I'm pretty sure it doesn't.

I did some housekeeping- not interning export symbols, which causes conflicts when systems that depend on this system are loaded I think,

and I changed the reference "imgs/" (ie a local dir named imgs/) to

(merge-pathnames
 "img/"
 (asdf:system-source-directory :arrokoth))

Oops, I meant to write #p"img/". Well, whatever, it doesn't matter.

This always refers to the directory arrokoth.asd was found in, so path/to/arrokoth/img/ in the end.

Similar, now it can either be referred to inside Arrokoth, though it might eventually become its own asdf system.