Add makefile to example

diff --git a/example/Makefile b/example/Makefile
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+++ b/example/Makefile
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+# Our languages
+LANGS = en es
+
+# Default source options
+NAME = example
+SOURCE = $(NAME: %=%.tex)
+DETAILS = true
+
+# Rules
+all: $(LANGS)
+
+# Default make to build these rules instead of files in case they exist
+.PHONY: all clean veryclean $(LANGS)
+
+# we need to clean before compiling a new language
+$(LANGS): clean        
+       # compile the language
+       $(eval INPUT="\def\defaultlang{\selectshortlanguage{$@}\details$(DETAILS)}\input{$(SOURCE)}")
+       pdflatex -interaction=nonstopmode $(INPUT) -jobname=$(NAME) || true
+       pdflatex -interaction=nonstopmode $(INPUT) -jobname=$(NAME) 
+       biber $(NAME)
+       pdflatex -interaction=nonstopmode $(INPUT) -jobname=$(NAME) || true
+       pdflatex -interaction=nonstopmode $(INPUT) -jobname=$(NAME) 
+       # if it finishes move the file to the correct name
+       mv $(NAME).pdf $(NAME)-$@.pdf
+
+
+# ignoramos los errores con -
+clean:
+       rm *.log *.aux *.out *.blg *.bbl *.run.xml *.bcf || true
+
+veryclean: clean
+       rm *.pdf || true
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