add README file

README.md

+# PTB Quarto reveal.js presentation template
+
+
+> Template for creating a new reveal.js article format for Quarto.
+>
+> See information about how-to use this repo template inside the
+> template file.
+
+This is a Quarto template that assists you in creating a presentation
+for use with PTB branding. You can learn more about
+about Quarto using the official guide <https://quarto.org/docs/guide/>.
+
+
+> [!NOTE]
+> Check out the [online demo](#).
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