Added scripts for pdf generation

makefile

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+all: concatenate
+
+[lesson_]%.pdf:	[lesson_]%.md 
+	pandoc --latex-engine=xelatex -t latex+tex_math_dollars -o $@ $<
+
+concatenate: [lesson_]%.pdf
+	pdftk $< cat output complete.pdf

markdown2pdf.sh

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+for file in *.md; do pandoc --latex-engine=xelatex -t latex+tex_math_dollars -o 
+$file.pdf $file; done

markdown2pdf2.sh

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+for i in {1..10}; do pandoc --latex-engine=xelatex -t 
+latex+tex_math_dollars -o lesson_$i.pdf lesson_$i.md; done
+