Issue #3278003: Add sub-module for media-library templates

modules/uswds_blb_configuration_media_library/.sass-lint.yml

 files:
   include: 'scss/**/*.s+(a|c)ss'
-  ignore: ['bower_components/**/*.s+(a|c)ss', 'scss/vendor/*.scss', 'scss/core/_normalize.scss']
+  ignore: ['bower_components/**/*.s+(a|c)ss', 'node_modules/**/*.s+(a|c)ss']
 options:
   formatter: stylish
   merge-default-rules: false

modules/uswds_blb_configuration_media_library/package.json

@@ -8,13 +8,15 @@
     "css:build": "npm run css:compile",
     "css:watch": "nodemon -e scss -x \"npm run css:build\" --ignore dist",
     "watch": "nodemon -e scss -x \"npm run build\" --ignore dist",
-    "build": "npm run css:build"
+    "build": "npm run css:build",
+    "lint": "sass-lint -c ./.sass-lint.yml '**/*.scss' -v -q"
   },
   "dependencies": {
     "autoprefixer": "^10.4.5",
     "node-sass": "^7.0.0",
     "node-sass-magic-importer": "^5.3.0",
     "nodemon": "^2.0.15",
-    "postcss-cli": "^9.1.0"
+    "postcss-cli": "^9.1.0",
+    "sass-lint": "^1.13.1"
   }
 }