Add script documentation to development docs

docs/development/scripts.md

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+# Helpful scripts
+
+Any of the scripts below can be run by typing `npm run <script name>` in the project's root directory.
+
+### Developing
+Script name | Description
+--- | ---
+`dev` | Spawn a hot-reloading dev server on port 3200.
+`deps-check` | Generate a size and licensing report on Swagger-UI's dependencies.
+`lint` | Report ESLint style errors and warnings.
+`lint-errors` | Report ESLint style errors, without warnings.
+`lint-fix` | Attempt to fix style errors automatically.
+`watch` | Rebuild the core files in `/dist` when the source code changes. Useful for `npm link` with Swagger-Editor.
+
+### Building
+Script name | Description
+--- | ---
+`build` | Build a new set of JS and CSS assets, and output them to `/dist`.
+`build-bundle` | Build `swagger-ui-bundle.js` only.
+`build-core` | Build `swagger-ui.(js|css)` only.
+`build-standalone` | Build `swagger-ui-standalone-preset.js` only.
+
+### Testing
+Script name | Description
+--- | ---
+`test` | Run unit tests in Node and run ESLint in errors-only mode.
+`just-test` | Run unit tests in the browser with Karma.
+`just-test-in-node` | Run unit tests in Node.
+`just-check-coverage` | Generate a code coverage report with NYC.
+`e2e` | Run end-to-end tests (requires JDK and Selenium).