Initial import

diff --git a/exsheet.cls b/exsheet.cls
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+++ b/exsheet.cls
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+% Stefan Huber, 2010-02
+% Stefan Huber, 2019-09-23
+% Stefan Huber, 2020-06-23
+% Stefan Huber, 2021-06-21
+
+\NeedsTeXFormat{LaTeX2e}
+\ProvidesClass{exsheet}
+
+
+\DeclareOption{10pt}{\PassOptionsToClass{\CurrentOption}{article}}
+\DeclareOption{12pt}{\PassOptionsToClass{\CurrentOption}{article}}
+
+\DeclareOption{german}{\def \exsheetgerman{}}
+\DeclareOption{ngerman}{\def \exsheetgerman{}}
+\DeclareOption{austrian}{\def \exsheetgerman{}}
+\DeclareOption{naustrian}{\def \exsheetgerman{}}
+\DeclareOption{showanswers}{\def \exsheetshowanswers{}}
+
+
+\PassOptionsToClass{a4paper,notitlepage,twoside}{article}
+\ProcessOptions\relax
+
+%-------------------- This is based on the article class ----------------
+
+\LoadClass{article}
+\RequirePackage{xifthen,geometry,fancyhdr,enumitem,comment}
+
+
+%------------------ Defining the most common environments ---------------
+
+\@ifundefined{exsheetgerman}{
+       \newcommand{\theexercise}{Exercise}
+       \newcommand{\thepoint}{Point}
+       \newcommand{\thepoints}{Points}
+       \newcommand{\thestudnumber}{Number}
+       \newcommand{\theanswer}{Answer}
+}{%
+       \newcommand{\theexercise}{Aufgabe}
+       \newcommand{\thepoint}{Punkt}
+       \newcommand{\thepoints}{Punkte}
+       \newcommand{\thestudnumber}{Personenkennzeichen}
+       \newcommand{\theanswer}{Antwort}
+}
+
+%Check whether we should show the answers
+\@ifundefined{exsheetshowanswers}{
+       \excludecomment{answer}
+}{
+       \newenvironment{answer}{\vspace*{0.5em}\textit{\theanswer:} \hspace*{0.5em} }{}
+}
+
+\newcounter{excounter}
+\setcounter{excounter}{1}
+\newenvironment{exercise}[1][]{%
+       \vspace*{2em}%
+       \textbf{\theexercise~\arabic{excounter}}:
+       \ifthenelse{\isempty{#1}}{}{%
+               \ifnum#1=1%
+                       \hfill[#1 \thepoint]%
+               \else%
+                       \hfill[#1 \thepoints]%
+               \fi%
+       }%
+       \newline}
+{\addtocounter{excounter}{1}} 
+
+
+\def\@semester{}
+\newcommand{\semester}[1]{\def\@semester{#1}}
+
+\def\@lva{}
+\newcommand{\lva}[1]{\def\@lva{#1}}
+
+\def\@auth{}
+\renewcommand{\author}[1]{\def\@auth{#1}\def\@author{#1}}
+
+\def\@institute{\ }
+\newcommand{\institute}[1]{\def\@institute{#1}}
+
+\newcommand{\studentinfo}{%
+       {
+       Name: \underline{\hspace{6cm}}
+       \hfill
+       \thestudnumber: \underline{\hspace{4cm}}
+       \vspace*{2em}
+       }
+}
+
+
+
+
+%------------------ Basic layout ----------------------------------------
+
+\geometry{verbose,a4paper,width=16cm,height=23cm}
+
+\fancypagestyle{exsheet}
+{
+       \fancyhf{}%
+  \fancyhead[LO,LE]{%
+                       \begin{minipage}{70mm}
+                               \@lva\\
+                               \@semester
+                         \vspace{1mm}
+                       \end{minipage}
+       }
+  \fancyhead[RO,RE]{%
+                       \begin{minipage}{70mm}
+                               \raggedleft
+                               \@institute\\
+                               \@auth
+                         \vspace{1mm}
+                       \end{minipage}
+       }
+}
+
+\setlength{\headheight}{2.5em}
+\renewcommand{\headrulewidth}{1pt}
+
+\setlength{\parindent}{0em}
+
+
+%------------------ Common command ---------------------------------------
+
+\let\oldmaketitle\maketitle
+
+\renewcommand{\@maketitle}{%
+       \noindent
+       \begin{center}
+               {\LARGE\bf\@title}\\
+               \vspace{1em}\@date
+       \end{center}
+
+       \vspace{4em}
+}
+
+\renewcommand{\maketitle}{%
+       \oldmaketitle
+       \thispagestyle{exsheet}
+       \pagestyle{exsheet}
+}
+
+
+\renewcommand\abstract{\it\noindent}
+
+%------------------ Defining specific commands environments ---------------
+
+\newenvironment{choices}{%
+       \begin{itemize}[label=$\square$, labelsep=2ex]
+       }{\end{itemize}}
+