more detailed note about clojure startup overhead.

clj/README.md

        what are the arguments to this function, what does this map mean;
        maybe clojure wants me to think differently)
    * the jvm overhead is bad for my little computer (too slow, too much
      memory consumed)
        memory consumed)
        it also makes it difficult to quickly explore some ideas without
        creating a new project (in most cases, mostly to get libraries),
        starting a jvm... etc.
        i'd really love a version of clojure without this overhead, even
        if it is a lot slower. maybe [clojure-scheme](https://github.com/takeoutweight/clojure-scheme)
        could be that.
## Hickups