Add preliminary materials about Concurrency Primer

Author: jserv

.gitignore

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+_minted*/
+*.aux
+*.log
+*.out
+*.pdf
+*.toc
+*.fls
+*.fdb_latexmk
+draftmark.tex
+lstlangarm.sty

CONTRIBUTING.md

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+Contributions are welcome!
+This paper is prepared in LaTeX - if you're not familiar with it,
+feel free to contact the author (via email, by opening an issue, etc.)
+in lieu of pull requests.

Makefile

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+lstlangarm.sty:
+	wget https://raw.githubusercontent.com/sysprog21/arm-assembler-latex-listings/master/lstlangarm.sty
+
+concurrency-primer.pdf: lstlangarm.sty concurrency-primer.tex
+	latexmk -lualatex -latexoption=-shell-escape concurrency-primer.tex
+
+# Clear the .DEFAULT_GOAL special variable, so that the following turns
+# to the first target after .DEFAULT_GOAL is not set.
+.DEFAULT_GOAL :=
+
+all: concurrency-primer.pdf
+
+clean:
+	rm -f *.dvi *.aux *.log *.ps *.pdf *.out *.bbl *.blg *.lof *.toc *.fdb_latexmk *.fls
+	rm -rf _minted-concurrency-primer
+
+distclean: clean
+	rm -f lstlangarm.sty

README.md

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+# Concurrency Primer
+
+This repository contains the LaTeX source for a pretentiously-named,
+but hopefully concise,
+introduction to low-level concurrency.
+
+## How do I build it?
+
+Install a modern, Unicode-aware LaTeX, such as LuaLaTeX.
+On Linux, this is usually as simple as installing the system TeX Live package, e.g., `texlive-base` or `texlive-core`.
+The same package should also provide the `latexmk` script. (See below)
+
+Install [pygments](http://pygments.org/), a Python syntax highlighter.
+This is used by the LaTeX package [minted](https://ctan.org/tex-archive/macros/latex/contrib/minted/) to handle our syntax highlighting.
+
+Build the document using
+```shell
+$ make
+```
+
+Note that `latexmk` will run LuaLaTeX multiple times, since TeX generates cross references in one pass, then links them in a second.
+
+If you can't use `latexmk` for some reason, you can manually invoke
+```shell
+$ lualatex -halt-on-error -shell-escape concurrency-primer.tex
+```
+until it no longer warns, "Label(s) may have changed. Rerun to get cross-references right."
+
+Enjoy a typeset `concurrency-primer.pdf`.