README: Add instructions for plain markdown (without R)

Change-Id: Iee09456a9eed02ce4b9de25fb480e7ed6b2aa604
diff --git a/README.md b/README.md
index 93326d0..cfef994 100644
--- a/README.md
+++ b/README.md
@@ -37,4 +37,47 @@
       `r posterdown.ids::qrlink('https://gitlab.ids-mannheim.de/ids/posterdown')`
 ```
 
+## Use without R for plain markdown
 
+Install [pandoc](https://pandoc.org/installing.html), create a simple `poster.md` file, for
+example:
+
+```markdown
+---
+title: "A Simple Test Poster"
+contact:
+  name: "Marc Kupietz"
+  website: "https://corpora.ids-mannheim.de/derekovecs"
+  department: "Digital Linguistics"
+  email: "kupietz@ids-mannheim.de"
+author:
+  - name: "Marc Kupietz"
+date: "2024-06-05"
+affiliation:
+  address: "IDS Mannheim"
+---
+
+# Introduction
+
+bla bla bla
+
+# Methods
+
+bla bla bla
+
+# Results
+
+bla bla bla
+
+# Discussion
+
+bla bla bla
+```
+
+Then run the following command:
+
+```bash
+pandoc poster.md --to html4 --from markdown+autolink_bare_uris+tex_math_single_backslash --wrap preserve --section-divs --template https://gitlab.ids-mannheim.de/ids/posterdown/-/raw/master/inst/rmarkdown/templates/posterdown_ids/resources/template.html?ref_type=heads --highlight-style pygments '--mathjax=https://mathjax.rstudio.com/latest/MathJax.js?config=TeX-AMS-MML_HTMLorMML' --citeproc --output poster.html
+```
+
+View the resulting `poster.html` in your browser and print it as a PDF (don´t forget to tick print backgrounds and possibly select only the first page).