add lecture class file

lecture.cls

@@ -0,0 +1,58 @@
+\ProvidesClass{lecture}
+\LoadClass[a4paper]{article}
+
+\RequirePackage[utf8]{inputenc}
+\RequirePackage[T1]{fontenc}
+\RequirePackage{textcomp}
+\RequirePackage[german]{babel}
+\RequirePackage{amsmath, amssymb, amsthm}
+\RequirePackage{mdframed}
+\RequirePackage{fancyhdr}
+\RequirePackage{geometry}
+\RequirePackage{import}
+\RequirePackage{pdfpages}
+\RequirePackage{transparent}
+\RequirePackage{xcolor}
+
+% PAGE GEOMETRY
+\geometry{
+    left=15mm,
+    right=40mm,
+    top=20mm,
+    bottom=20mm
+}
+
+% PARAGRAPH no indent but skip
+\setlength{\parskip}{3mm}
+\setlength{\parindent}{0mm}
+
+\theoremstyle{definition}
+\newmdtheoremenv{satz}{Satz}
+\newmdtheoremenv{lemma}{Lemma}
+\newmdtheoremenv{korrolar}{Korrolar}
+\newmdtheoremenv{definition}{Definition}
+
+\newtheorem{bsp}{Beispiel}
+\newtheorem{bem}{Bemerkung}
+\newtheorem{aufgabe}{Aufgabe}
+
+\newcommand{\N}{\mathbb{N}}
+\newcommand{\R}{\mathbb{R}}
+\newcommand{\Z}{\mathbb{Z}}
+\newcommand{\Q}{\mathbb{Q}}
+\newcommand{\C}{\mathbb{C}}
+
+% HEADERS
+
+\pagestyle{fancy}
+
+\newcommand{\incfig}[1]{%
+    \def\svgwidth{\columnwidth}
+    \import{./figures/}{#1.pdf_tex}
+}
+\pdfsuppresswarningpagegroup=1
+
+% horizontal rule
+\newcommand\hr{
+    \noindent\rule[0.5ex]{\linewidth}{0.5pt}
+}