chore(markdown): Updated plugin docs

markdown/dev/reference/plugins/export-dxf/en.md

@@ -0,0 +1,45 @@
+---
+title: "@freesewing/plugin-export-dxf"
+---
+
+The **@freesewing/plugin-export-dxf** plugin exports your pattern
+to [the DXF file format](https://en.wikipedia.org/wiki/AutoCAD_DXF). 
+It will attach the [the postDraft lifecycle
+hook](/reference/api/hooks/postdraft) to add a `renderDxf()` method
+to the pattern object.
+
+<Warning>
+
+##### Maintainer note: This is de-facto unmaintained
+
+This plugin is de-facto unmaintained because I have no use for it.
+I keep it around in case it might be useful, and I've used it 
+myself for exporting to different software.
+
+The being said, DXF is a poor choice as a file format for storing sewing patterns.
+For one thing, it only allows straight lines, no curves. Yikes!
+
+</Warning>
+
+## Installation
+
+```sh
+npm install @freesewing/plugin-export-dxf
+```
+
+## Usage
+
+Like all [run-time plugins](/guides/plugins/types-of-plugins#run-time-plugins), you
+load them by by passing them to the `use()` method of an instatiated pattern. 
+
+That method is chainable, so if you have multiple plugins you can just chain them together.
+
+```js
+import Aaron from "@freesewing/aaron";
+import theme from "@freesewing/plugin-theme";
+
+const pattern = new Aaron().use(theme);
+```
+
+After calling `pattern.draft()` you will be able to call `pattern.renderDxf()` 
+which will return the Dxf output.