update marp experiment

Author: brainboxemb

docs/experiments/2026/001-marp/README.md

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+# EXP-2026-001 — Marp
+
+Experiment with creating presentations using Markdown and Marp.
+
+* **Started:** 2026-07-28
+* **Status:** In progress
+
+## Step 1 — First presentation
+
+Install the **Marp for VS Code** extension and create a first presentation.
+
+Create:
+
+```text
+steps/001-first-presentation/presentation.md
+```
+
+The presentation contains:
+
+1. A title slide
+2. A short introduction to Marp
+3. The goal of the experiment
+4. Planned next steps
+
+```markdown
+---
+marp: true
+theme: default
+paginate: true
+---
+
+# Marp Experiment
+
+Creating presentations with Markdown.
+
+---
+
+# What is Marp?
+
+Marp is a tool for creating presentations using Markdown.
+
+Slides are separated using three dashes.
+
+---
+
+# Experiment Goal
+
+Explore how Marp can be used to:
+
+- create presentations;
+- preview slides in Visual Studio Code;
+- add images and styling;
+- export presentations.
+
+---
+
+# Next Steps
+
+- Test slide layouts
+- Add images
+- Test themes
+- Export the presentation
+```
+
+Open the Markdown preview in Visual Studio Code to view the presentation.
+
+### Result
+
+A presentation should be visible. The actual result will be saved as PDF in the next step.
+
+
+## Step 2 — Export to PDF
+
+Export the presentation so it can be viewed outside Visual Studio Code.
+
+Click the Marp icon in the editor toolbar:
+
+![Marp icon in the Visual Studio Code toolbar](./_images/marp-export-icon.png ':size=420')
+
+Select **Export slide deck...**, choose **PDF** and save the result as:
+
+```text
+steps/001-first-presentation/presentation.pdf