UND-77 Adding the linting for scss and js

Author: surbhi90

.editorconfig

@@ -0,0 +1,10 @@
+root = true
+
+[*]
+indent_style = space
+indent_size = 2
+tab_width = 2
+end_of_line = lf
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true

.eslintrc.json

@@ -0,0 +1,33 @@
+{
+	"env": {
+		"browser": true,
+		"es2021": true
+	},
+	"extends": [
+		"plugin:react/recommended",
+		"airbnb",
+		"plugin:mdx/recommended"	
+	],
+	"parserOptions": {
+		"ecmaFeatures": {
+				"jsx": true
+		},
+		"ecmaVersion": 12,
+		"sourceType": "module"
+	},
+	"plugins": [
+		"react",
+		"spellcheck"
+	],
+	"rules": {
+		"spellcheck/spell-checker": ["warn"]
+	},
+	"settings": {
+		"mdx/code-blocks": true
+	},
+	"overrides": [
+		{
+			"files": ["stories/**/*.jsx", "stories/**/*.mdx"]
+		}
+	]
+}

.stylelintrc.json

@@ -0,0 +1,22 @@
+{
+  "plugins": [
+    "stylelint-scss"
+  ],
+  "extends": [
+    "stylelint-config-standard", 
+    "stylelint-config-sass-guidelines"
+  ],
+  "defaultSeverity": "warning",
+  "rules": {
+    "max-nesting-depth": 2,
+    "selector-max-compound-selectors": 3,
+    "no-duplicate-selectors": null,
+    "no-descending-specificity": null,
+    "property-no-unknown": [
+      true,
+      {
+        "ignoreProperties": ["/box-*/", "/flex-*/"]
+      }
+    ]
+  }
+}