Add README.md and rendered png to all folders except for /documents

The examples were found by

```bash
$ find . -not -path '*/\.*' -type d '!' -exec test -e "{}/README.md" ';' -print
```

To do so, a cleanup-script .meta/add_readme.py was created.

images/float/Makefile

@@ -1,8 +1,33 @@
 SOURCE = float
+DELAY = 80
+DENSITY = 300
+WIDTH = 512
 
 make:
 	pdflatex $(SOURCE).tex -output-format=pdf
 	make clean
 
 clean:
-	rm -rf  $(TARGET) *.class *.html *.log *.aux *.out *.ind *.idx *.ilg *.toc *.bbl *.blg *.pyg
+	rm -rf  $(TARGET) *.class *.html *.log *.aux *.data *.gnuplot
+
+gif:
+	pdfcrop $(SOURCE).pdf
+	convert -verbose -delay $(DELAY) -loop 0 -density $(DENSITY) $(SOURCE)-crop.pdf $(SOURCE).gif
+	make clean
+
+png:
+	make
+	make svg
+	inkscape $(SOURCE).svg -w $(WIDTH) --export-png=$(SOURCE).png
+
+transparentGif:
+	convert $(SOURCE).pdf -transparent white result.gif
+	make clean
+
+svg:
+	#inkscape $(SOURCE).pdf --export-plain-svg=$(SOURCE).svg
+	pdf2svg $(SOURCE).pdf $(SOURCE).svg
+	# Necessary, as pdf2svg does not always create valid svgs:
+	inkscape $(SOURCE).svg --export-width=$(WIDTH) --export-plain-svg=$(SOURCE)1.svg
+	rsvg-convert -a -w 720 -f svg $(SOURCE)1.svg -o $(SOURCE).svg
+	rm $(SOURCE)1.svg

images/float/README.md

@@ -0,0 +1,3 @@
+Compiled example
+----------------
+![Example](float.png)