Add Stylelint feature

Author: jgarber623-cargosense

src/stylelint/README.md

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+# stylelint
+
+Install and configure [Stylelint](https://stylelint.io)'s [official Visual Studio Code extension](https://github.com/stylelint/vscode-stylelint).
+
+## Usage
+
+```json
+"features": {
+  "ghcr.io/CargoSense/devcontainer-features/stylelint:1": {}
+}
+```
+
+> [!NOTE]
+> From v1.0.0, the vscode-stylelint extension [does not bundle Stylelint](https://github.com/stylelint/vscode-stylelint#%EF%B8%8F-stylelint-is-no-longer-bundled). Be sure to add an up-to-date version of Stylelint to your project's `package.json` file.
+
+## OS Support
+
+This Feature should work on any operating system supported by Stylelint.

src/stylelint/devcontainer-feature.json

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+{
+  "name": "Stylelint",
+  "id": "stylelint",
+  "version": "1.0.0",
+  "description": "Install and configure Stylelint's official Visual Studio Code extension.",
+  "customizations": {
+    "vscode": {
+      "extensions": ["stylelint.vscode-stylelint"],
+      "settings": {
+        "css.validate": false,
+        "less.validate": false,
+        "scss.validate": false,
+        "stylelint.validate": ["css", "postcss", "scss"]
+      }
+    }
+  },
+  "installsAfter": [
+    "ghcr.io/devcontainers/features/common-utils"
+  ]
+}

src/stylelint/install.sh

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+#!/usr/bin/env sh
+
+# noop