we use two spaces indent.

Also I would phrase this different:

```
To install Clojure or ClojureScript you should install Leiningen:
  brew install leiningen
Clojure isn't really a program but a library managed as part of a
project and leiningen is the user interface to that library.
```

I would also like to add one line that the user can type, so that lein installs the current clojure. Do you have a one-liner?