update readme

Makefile

@@ -40,13 +40,13 @@ BOOKLETPDF = $(PDFDIR)/booklet.pdf
 
 MIDITEMPO = 120
 
-all: pdfs midis opus book booklet
+all: pdfs midis music book booklet
 
 pdfs: $(PDFS)
 
 midis: pdfs $(MIDIS)
 
-opus: midis $(OPUSFILES)
+music: midis $(OPUSFILES)
 
 book: $(BOOKPDF)
 

README.md

@@ -18,20 +18,32 @@ with something like [git](http://git-scm.com/).
 
 Development
 -----------
+
 Main development happens at https://code.vanwa.ch/sing-alongs but there is a
 mirror of the git repository on [Github](https://github.com/thallian/sing_alongs).
 
-The master branch contains only full songs (lyrics, melody and chords) and the
-only time it is updated is for changing layout related stuff or merging a song.
+Take a look at the command list in the makefile to see what you need for building.
 
-Songs live in their own branch. If there is an error the branch gets fixed and
-then merged into the master. I am not sure how well this goes with a growing
-number of songs but lets see ;)  
-Also, the older songs may not have their own branch yet, so it has to be
-created when the first correction comes up.
+The makefile defines multiple targets:
 
-WRITE SOMETHING ABOUT THE MAKEFILE
+- pdfs: builds all songs as single pdfs (without lyrics for now)
+- midis: builds the midi file for each song
+- music: converts the midi files into opus files
+- book: concatenates the songs (with lyrics) to a songbook
+- booklet: converts the songbook to a booklet fit for double sided flip printing
+
+To build all just run `make` and it takes care of everything.
+
+License Stuff
+-------------
+
+I am still not quite clear on how this works. My understanding is that all these
+songs already are in the public domain and there is no need to explicitly set a license.
+
+All copyrights that could arise from other sides (makefile or whatever) are waived
+under [CC0](https://creativecommons.org/publicdomain/zero/1.0/).
 
 Contact
 -------
+
 You can reach me at [shugentobler@vanwa.ch](mailto:hugentobler@vanwa.ch)