Add markdown template (#209)

source/templates/markdown/example.md

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+# 📒 Markdown template example
+
+This is a markdown template example which explain the basic usage of this template.
+
+## 🈂️ Templating syntax:
+
+* Regular EJS syntax is supported
+* `{{` and `}}` will be interpolated as EJS brackets (syntaxic sugar)
+  * `{%` and `%}` can be used as control statements
+* Use [metrics.lecoq.io](https://metrics.lecoq.io/) with `config.output=json` to see available data
+  * You can also use `config_output: json` in GitHub Actions and/or inspect [metrics](https://github.com/lowlighter/metrics) code to get available data too
+
+## 🧩 Markdown plugins
+
+Most of plugins from SVG templates can be reused directly by including image source in markdown, but some have them have their own **markdown** version which includes hyperlinks.
+
+### 📰 Recent activity
+
+<%- await include(`partials/activity.ejs`) %>
+
+### ✒️ Recent posts
+
+*Coming soon*
+
+### 🗼 Rss feed
+
+*Coming soon*