feat(markdown): Added dev docs for different environments

markdown/dev/howtos/environments/nodejs/en.md

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+---
+title: FreeSewing in NodeJS
+---
+
+These instructions explain how you can generate patterns in NodeJS.
+Whether it's in a backend application or on the command line, all
+it takes is a few lines of code — and a couple of dependencies — to
+generate a pattern.
+
+<Tip>
+
+##### Use FreeSewing.org if you just want a pattern
+
+These instructions are intended for people who want to generate
+their own patterns. If you *just want a sewing pattern* you can
+get all our designs on [FreeSewing.org](https://FreeSewing.org/),
+our website for makers.
+
+</Tip> 
+
+## High level overview
+
+To generate a pattern, you will need to:
+
+ - Instantiate the pattern (`new ...`)
+ - Pass it the settings and measurements you want to use (`{ ... }`)
+ - Load the theme plugin (using `use()`)
+ - Draft the pattern (using `draft()`)
+ - Render it to SVG  (using `render()`)
+
+Which can be done as a one-liner since `use()`, `draft()` and
+`render()` are all chainable, as shown below.
+
+## Code example
+
+```js
+import Aaron from '@freesewing/aaron' // Design to use
+import theme from '@freesewing/plugin-theme' // SVG theme
+
+const svg = new Aaron( // Instantiate pattern
+  { // Pass in settings. See reference > core > settings
+    sa: 10, // Seam allowance
+    // ... 
+    measurements: { // Pass in measurements
+      biceps: 387,
+      chest: 1105,
+      hips: 928,
+      hpsToWaistBack: 502,
+      neck: 420,
+      shoulderSlope: 13,
+      shoulderToShoulder: 481,
+      waistToHips: 139,
+    }
+  })
+  .use(theme) // Load theme plugin
+  .draft() // Draft the pattern
+  .render() // Render to SVG
+
+// svg now holds the generated SVG code
+console.log(svg)
+```
+
+<Note>
+
+##### Remarks on the example code
+
+- We are using `@freesewing/aaron` as the design, but you could use any design
+- You probably want to [use your own measurements](/reference/api/settings/measurements)
+or you could use `@freesewing/models` to load measurements from [our sizing grid](https://freesewing.org/sizes/)
+- We are using `@freesewing/plugin-theme` to theme our SVG, but you 
+could [pass in your own CSS](/guides/plugins/using-hooks-without-plugin)
+
+</Note>
+
+## Dependencies
+
+The code above will only work if you've got the required dependencies installed on your system.
+Obviously you need NodeJS, but you will also need the following packages:
+
+ - `@freesewing/core`: Our core library
+ - `@freesewing/plugin-bundle`: Set of common plugins
+ - `@freesewing/aaron` or any design you want to use
+ - Any design on which the design you choose is built. In this case, Aaron depends on `@freesewing/brian`
+ - `@freesewing/utils`
+
+For the example above, your `package.json` **dependencies** section will look like this:
+
+```json
+  "dependencies": {
+    "@freesewing/core": "latest"
+    "@freesewing/aaron": "latest",
+    "@freesewing/brian": "latest",
+    "@freesewing/models": "latest",
+    "@freesewing/plugin-bundle": "latest",
+    "@freesewing/plugin-theme": "latest",
+    "@freesewing/utils": "latest"
+  }
+```