2017-08-20: README: note the releases and split usage into setup+usage

README: note the releases and split usage into setup+usage

diff --git a/README.md b/README.md
--- a/README.md
+++ b/README.md
@@ -34,18 +34,30 @@ Requirements
 [GNU Guile 2.x]: http://gnu.org/s/guile "GNU Guile: The official extension language for the GNU operating system."
 [Python 3.x]: http://python.org "Python Programming Language"
 
-Usage
+Setup
 -----
 
+From the repository:
+
 * Get wisp: `hg clone http://draketo.de/proj/wisp` (needs [Mercurial](http://mercurial-scm.org))
 * Bootstrap: `cd wisp && autoreconf -i && ./configure && make`
-* Preprocess files: `guile ./wisp.scm infile.wisp > outfile.scm`
-* Wisp at the REPL: `guile -L . --language=wisp # in the wisp-folder`
+
+From a release:
+
+* Get a release from [bitbucket.org/ArneBab/wisp/downloads/](https://bitbucket.org/ArneBab/wisp/downloads/)
+* Unpack and build: `tar xf [release].tar.gz; cd [release]; ./configure; make`
 
 Install systemwide with `./configure --datarootdir=/usr/share && sudo make install`, then you can run `guile --language=wisp` anywhere. Install in your home folder with `./configure --prefix=$HOME/.local; make install`. Use `guile -c '(import (language wisp spec))'` to get rid of auto-compile errors.
 
 Run tests with `make check`. Distribute your own version with `make distcheck`.
 
+Usage
+-----
+
+* Preprocess files: `guile ./wisp.scm infile.wisp > outfile.scm`
+* Wisp at the REPL: `guile -L . --language=wisp # in the wisp-folder`
+* The files in examples/ show how to make executable wisp programs.
+
 Wisp and curly infix (SRFI-105)
 -------------------------------