Set papersize, change subtitle

OSZ/Exercise_generic.md

@@ -1,8 +1,11 @@
 ---
 author: Johannes Reinert
 title: Aufgabe
+subtitle: FI-C04
 date: \today
 colorlinks: true
+documentclass: article
+papersize: a4
 header-includes: |
     \usepackage{fancyhdr}
     \usepackage{csquotes}
@@ -10,7 +13,7 @@ header-includes: |
     \usepackage{hyphenat}
     \hyphenation{Mathe-matik wieder-gewinnen}
     \pagestyle{fancy}
-    \fancyhead[L]{OSZIMT}
+    \fancyhead[L]{FI-C04}
     \fancyfoot[L]{Johannes Reinert}
     \fancyfoot[R]{\today}
 ---