README: add thumbnail and comment out alternative footer example

README.md

@@ -1,5 +1,7 @@
 # Typst unofficial KFU letter template
 
+![thumbnail](thumbnail.png)
+
 ## Installation (Linux only)
 
 #### Using [`typship`](https://github.com/sjfhsjfh/typship)
@@ -22,4 +24,72 @@ curl https://imsc.uni-graz.at/git/gjankowiak/typst-kfu-letter/archive/0.1.0.tar.
 typst init @local/kfu-letter letter
 ```
 
+
+## Template
+
+```typst
+#import "@local/kfu-letter:0.1.0": letter
+
+#letter(
+lang: "de",
+
+place: "Graz",
+// the date is not automatically localized in Typst,
+// you have to date care of that.
+date: datetime.today().display("[day].[month].[year]"),
+
+title: "Dr.",
+firstname: "John",
+lastname: "Doe",
+
+departement: [Institut für Mathematik und Wissenschaftliches Rechnen],
+
+address: "Heinrichstraße 36, 8010 Graz",
+
+phone: 1234,
+
+homepage: "https://imsc.uni-graz.at/doe",
+
+subject: [The letter subject should fit on one line.],
+
+signature: none,
+  // [Mit freundlichen Grüßen
+  //
+  // Dr. John Doe
+  // #image("signature.png")],
+[
+  This is the letter' first page's body.
+
+  #lorem(200)
+
+  #lorem(200)
+])
+
+// The CD manual of the KFU [1] requires the contact information of the sender to be placed in the footer
+// except for the first page, where it is placed above the date. This is not naturally doable in Typst.
+// On way is to provide the content of the other pages separately with the `body` option, as follows:
+//
+// [1] https://static.uni-graz.at/fileadmin/presse/Sonstiges/Corporate_Design_Manual_Uni_Graz_2023.pdf
+//
+// #letter( /* your options here */
+//   date: datetime.today().display("[day].[month].[year]"),
+// [
+//   This is the content of the first page, you have to make sure it does not overflows to the second page.
+// ],
+// body: [
+//   This is the content of the following pages. It will always start with a page break.
+//
+//   #lorem(200)
+//
+//   #lorem(200)
+// ])
+```
+
+
+Compile with
+
+```sh
+typst compile letter.typ
+```
+
 Tested typst version: `0.14.2`.