docs: update README with options and examples

README.md

@@ -8,6 +8,51 @@
 
 ## Features
 
-- Extensive syntax and theme support
+- Extensive [syntax](https://pygments.org/languages/) and [theme](https://pygments.org/styles/) support - powered by [Pygments](https://pygments.org)
+- Set font and font size
+- Set indentation size
 
-## Usage
+## Usage
+
+1. Install package
+
+   ```shell
+   pip install syntaxedit
+   ```
+
+   Or
+
+   ```shell
+   poetry add syntaxedit
+   ```
+
+2. In your app, include the package, and create a `SyntaxEdit` widget:
+
+    ```python
+    from syntaxedit.core import SyntaxEdit
+
+    code = """# Todo list
+
+    - [ ] Go shopping
+    - [x] Walk the dog"""
+
+    widget = SyntaxEdit(code)
+    ```
+
+### Available options
+
+- `content`: the initial content for the widget. **Default:** `""`
+- `parent`: parent Qt widget for SyntaxEdit. **Default:** `None`
+- `font`: the font family for the widget. **Default:** `"Courier New"`
+- `font_size`: size to use for the font. **Default:** `13`
+- `syntax`: the code [syntax](https://pygments.org/languages/) to use. **Default:** `"Markdown"`
+- `theme`: the syntax [theme](https://pygments.org/styles/) to use. **Default:** `"solarized-light"`
+- `indentation_size`: the size for indentation. **Default:** `4`
+
+## Authors
+
+By [David Winter](https://github.com/davidwinter)
+
+## License
+
+MIT