Development docs!

docs/development/setting-up.md

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+# Setting up a dev environment
+
+Swagger-UI includes a development server that provides hot module reloading and unminified stack traces, for easier development.
+
+### Prerequisites
+
+- Node.js `6.0.0` or greater
+- npm `3.0.0` or greater
+- git, any version
+
+
+### Steps
+
+1. `git clone git@github.com:swagger-api/swagger-ui.git`
+2. `cd swagger-ui`
+3. `npm install`
+4. `npm run dev`
+5. Wait a bit
+6. Open http://localhost:3200/
+
+## Bonus round
+
+- Swagger-UI includes an ESLint rule definition. If you use a graphical editor, consider installing an ESLint plugin, which will point out syntax and style errors for you as you code.
+  - The linter runs as part of the PR test sequence, so don't think you can get away with not paying attention to it!