add faktor package documentation

doc/math/faktor/.latexmkrc

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+$makeindex = "makeindex -s gind.ist %O -o %D %S";
+$clean_ext .= ' glo';
+$clean_ext .= ' hd';
+$clean_ext .= ' ins';

doc/math/faktor/Makefile

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+doc:
+	latexmk
+
+full:
+	latexmk -gg
+
+clean:
+	latexmk -C

doc/math/faktor/faktor.tex

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+\documentclass[full]{l3doc}
+
+\title{The \pkg{mkessler-faktor} package}
+\author{Maximilian Keßler}
+
+\usepackage{mkessler-faktor}
+
+\begin{document}
+
+\maketitle
+
+\begin{abstract}
+  The \pkg{faktor} package provides a mechanism to produce fractions
+  for mathematical factors.
+  Its mechanism is, however, quite limited.
+  Inspired by the
+  \href{https://tex.stackexchange.com/}{Tex StackExchange}
+  answer of user
+  \href{https://tex.stackexchange.com/users/5764/werner}{Werner},
+  that was given on
+  \href{https://tex.stackexchange.com/questions/27591/extending-the-faktor-package}
+  {https://tex.stackexchange.com/\allowbreak questions/\allowbreak 27591/extending-the-faktor-package}
+  we provide a simple package that wraps (and slightly modifies)
+  the given answer into a more general \cs{faktor} command.
+\end{abstract}
+
+\begin{function}{\faktor}
+\begin{function}{\faktor*}
+  \begin{syntax}
+    \cs{faktor}*\oarg{shift enumerator}\marg{enumerator}\oarg{shift denominator}\marg{denominator}
+  \end{syntax}
+  Produces a fraction with tilted \enquote{$\diagup$} symbol and the corresponding
+  \meta{enumerator} and \meta{denominator}.
+  The  \enquote{$\diagup$} symbol is automatically scaled.
+
+  The \meta{shift} parameters can be controlled to fine tune the vertical
+  placement of \meta{enumerator} and \meta{denominator}.
+  Their default values when not given are \texttt{0.5} and \texttt{-0.5},
+  respectively.
+
+  The \enquote{*} can be optionally given. This will make the \cs{faktor}
+  behave like the old \cs{faktor} command from the \cs{faktor} package,
+  that is, the \enquote{$\diagup$} won't scale.
+\end{function}
+\end{function}
+
+\begin{function}{\cofaktor}
+\begin{function}{\cofaktor*}
+  \begin{syntax}
+    \cs{faktor}*\oarg{shift denominator}\marg{denominator}\oarg{shift enumerator}\marg{enumerator}
+  \end{syntax}
+  Behaves the same as \cs{faktor}, but produces a \cs{cofaktor}.
+\end{function}
+\end{function}
+
+
+\PrintIndex
+  
+\end{document}