Add demo presentation

examples/demo.md

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+---
+title: Introducing presenterm
+author: Matias
+---
+
+Introduction slide
+---
+
+An introduction slide can be defined by using a front matter at the beginning of the markdown file:
+
+```yaml
+---
+title: My presentation title
+sub_title: An optional subtitle
+author: Your name which will appear somewhere in the bottom
+---
+```
+
+The slide's theme can also be configured in the front matter:
+
+```yaml
+---
+theme:
+  # Specify it by name for built-in themes
+  name: my-favorite-theme
+
+  # Otherwise specify the path for it
+  path: /home/myself/themes/epic.yaml
+
+  # Or override parts of the theme right here
+  override:
+    default:
+      colors:
+        foreground: white
+---
+```
+
+<!-- end_slide -->
+
+Headers
+---
+
+Using commonmark setext headers allows you to set titles for your slides (like seen above!):
+
+```
+Headers
+---
+```
+
+# Other headers
+
+All other header types are simply treated as headers within your slide.
+
+## Subheaders
+### And more
+
+<!-- end_slide -->
+
+Slide commands
+---
+
+Certain commands in the form of HTML comments can be used:
+
+# Ending slides
+
+In order to end a single slide, use:
+
+```html
+<!-- end_slide -->
+```
+
+# Creating pauses
+
+Slides can be paused by using the `pause` command:
+
+```html
+<!-- pause -->
+```
+
+This allows you to:
+
+<!-- pause -->
+* Create suspense.
+<!-- pause -->
+* Have more interactive presentations.
+<!-- pause -->
+* Possibly more!
+
+<!-- end_slide -->
+
+Code highlighting
+---
+
+Code highlighting is enabled for code blocks that include the most commonly used programming languages:
+
+```rust
+// Rust
+fn greet() -> &'static str {
+    "hi mom"
+}
+```
+
+```python
+# Python
+def greet() -> str:
+    return "hi mom"
+```
+
+```cpp
+// C++
+string greet() {
+    return "hi mom";
+}
+```
+
+And many more!
+
+<!-- end_slide -->
+
+Text formatting
+---
+
+Text formatting works as expected:
+
+* **This is bold text**.
+* _This is italics_.
+* **This is bold _and this is bold and italic_**.
+* ~This is strikethrough text.~
+* Inline code `is also supported`.
+* Links look like this [](https://example.com/)
+
+<!-- end_slide -->
+
+Images
+---
+
+Image rendering is supported as long as you're using iterm2, your terminal supports
+the kitty graphics protocol (such as the kitty terminal itself!), or the sixel format.
+
+* Include images in your slides by using `![](path-to-image.extension)`.
+* Images will be rendered in **their original size**.
+    * If they're too big they will be scaled down to fit the screen.
+
+![](doge.png)
+
+_Picture by Alexis Bailey / CC BY-NC 4.0_
+