added image of star-shaped domain

tikz/star-shaped-domain/Makefile

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+SOURCE = star-shaped-domain
+DELAY = 80
+DENSITY = 300
+WIDTH = 512
+
+make:
+	pdflatex $(SOURCE).tex -output-format=pdf
+	make clean
+
+clean:
+	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 $(SOURCE).svg --export-plain-svg=$(SOURCE).svg

tikz/star-shaped-domain/Readme.md

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+Compiled example
+----------------
+![Example](star-shaped-domain.png)

tikz/star-shaped-domain/star-shaped-domain.tex

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+\documentclass[varwidth=true, border=2pt]{standalone}
+\usepackage{tikz}
+\usetikzlibrary{patterns}
+
+\begin{document}
+\begin{tikzpicture}[thick]
+    \tikzstyle{point}=[circle,thick,draw=black,fill=black,inner sep=0pt,minimum width=4pt,minimum height=4pt]
+    \draw[fill=orange!20] (-2,0) -- (-1,0.5) -- (0,2) -- (1,0.5) -- (2,0) -- (1,-0.5) -- (0,-2) -- (-1,-0.5) -- cycle;
+    \node (a)[point,label=$x$] at (0,0) {};
+\end{tikzpicture}
+\end{document}