add foss course for hs22

HS22_FOSS/bib.bib

+% Encoding: UTF-8
+
+@Electronic{oss,
+  author       = {{Open Source Initiative}},
+  title        = {{The Open Source Definition}},
+  howpublished = {\href{http://web.archive.org/web/20160817171310/https://opensource.org/docs/osd}{opensource.org/docs/osd (via the Internet Archive)}},
+  organization = {Open Source Initiative},
+  url          = {http://web.archive.org/web/20160817171310/https://opensource.org/docs/osd},
+  owner        = {chymera},
+  timestamp    = {2016.10.04},
+}
+@Electronic{linux,
+  author       = {Jonathan Corbet and
+    Greg Kroah-Hartman
+    },
+  title        = {{2017 Linux Kernel Development Report}},
+  howpublished = {\href{https://www.linuxfoundation.org/2017-linux-kernel-report-landing-page/}{www.linuxfoundation.org/2017-linux-kernel-report-landing-page/ (via the Linux Foundation)}},
+  organization = {Linux Foundation},
+  url          = {https://go.pardot.com/l/6342/2017-10-24/3xr3f2/6342/188781/Publication_LinuxKernelReport_2017.pdf},
+  owner        = {chymera},
+  timestamp    = {2017.9.30},
+}
+
+@Comment{jabref-meta: databaseType:bibtex;}

HS22_FOSS/code.sty

+\ProvidesPackage{code}
+
+\usepackage{tcolorbox}
+\usepackage{url}
+
+
+\usepackage{tikz}
+\usetikzlibrary{tikzmark,calc,,arrows,shapes,decorations.pathreplacing}
+\tikzset{every picture/.style={remember picture}}
+
+\tcbuselibrary{skins,xparse,listings}
+
+% Props to https://tex.stackexchange.com/questions/517976/drawing-realistic-linux-command-shell-windows-with-tcolorbox
+
+\newtcblisting{shell}{
+    colback=violet!50!black,
+    colupper=white,
+    colframe=gray!65!black,
+    listing only,
+    listing options={
+        style=tcblatex,
+        language=sh,escapeinside=``,
+    },
+    title={\textcolor{orange}{\Large{$\bullet$}}{\textcolor{gray}{\Large{$\bullet\bullet$}}}},
+    every listing line={\MyMainPrompt}
+}
+
+\newtcblisting{ccode}{
+    colback=violet!50!black,
+    colupper=white,
+    colframe=gray!65!black,
+    listing only,
+    listing options={
+        style=tcblatex,
+        language=c,escapeinside=``,
+        showstringspaces=false,
+    },
+    title={\textcolor{orange}{\Large{$\bullet$}}{\textcolor{gray}{\Large{$\bullet\bullet$}}}},
+}
+
+\newtcblisting{hex}{
+    colback=violet!50!black,
+    colupper=white,
+    colframe=gray!65!black,
+    listing only,
+    listing options={
+        style=tcblatex,
+        language=c,escapeinside=``,
+        showstringspaces=false,
+        basicstyle=\scriptsize\ttfamily
+    },
+    title={\textcolor{orange}{\Large{$\bullet$}}{\textcolor{gray}{\Large{$\bullet\bullet$}}}},
+}
+
+\newtcblisting{shellcomp}{
+    colback=violet!50!black,
+    colupper=white,
+    colframe=gray!65!black,
+    listing only,
+    listing options={
+        style=tcblatex,
+        language=sh,escapeinside=``,
+    },
+    every listing line={\MyMainPrompt}
+}
+\pgfkeys{/shell/.cd,
+    user/.code={\gdef\MyMainUser{#1}},
+    user={},
+    host/.code={\gdef\MyMainHost{#1}},
+    host={},
+    color/.code={\gdef\MyMainColor{#1}},
+    color=white,
+    pwd/.code={\gdef\MyMainPwd{#1}},
+    pwd=\~,
+    prompt char/.code={\gdef\MyMainPromptChar{#1}},
+    prompt char=\#,
+    root/.style={user=root,host=ubuntu,color=lime,pwd=/,prompt char=\#},
+    bob/.style={user=bob,host=ubuntu,color=cyan,pwd=\~,prompt char=\$},
+    bobremote/.style={user=bob,host=myRemote,color=green,pwd=\~,prompt char=>},
+    alice/.style={user=alice,host=arch,color=green,pwd=\~,prompt char=>},
+}
+\newcommand{\SU}[1]{
+    \pgfkeys{/shell/.cd,#1}%
+    \gdef\MyMainPrompt{\textcolor{\MyMainColor}{\MyMainUser @\MyMainHost{\textcolor{white}:}\textcolor{cyan!60}{\url{\MyMainPwd}}{\textcolor{white}\MyMainPromptChar} }}
+}
+\newcommand{\StartConsole}{\gdef\MyMainPrompt{}}

HS22_FOSS/data/web_os.csv

+Name,percent
+Unix,80.3
+Windows,20.0

HS22_FOSS/data/web_servers.csv

+Name,percent
+Nginx,34.3
+Apache,31.2
+LiteSpeed,12.2
+Cloudflare Server,21.6
+Microsoft-IIS,5.9

HS22_FOSS/general.sty

+\ProvidesPackage{general}
+
+\usepackage[T1]{fontenc}
+\usepackage{xcolor}
+\usepackage{multicol}
+\usepackage{hyperref}
+\usepackage{lmodern}
+\usepackage{listings}
+\usepackage[os=win]{menukeys}
+\usepackage{tcolorbox}
+\usepackage[style=norwegian]{csquotes}
+\usepackage{siunitx}
+\usepackage{datatool}
+\usepackage{datapie}
+
+\usefonttheme[onlymath]{serif}
+\setcounter{MaxMatrixCols}{20}
+
+\newcommand{\todo}[1]{\textcolor{red}{TODO: #1}\PackageWarning{TODO:}{#1!}}
+
+% a red warning box
+\definecolor{lred}{HTML}{ffd6dd}
+\newtcolorbox{WarningBox}{%
+    colframe=red,
+    colback=lred}