feat(main): Add base theme: This is the falcon theme out of the box.

This is falcon v3.1.2

falcon/_dev/.eslintrc.js

@@ -0,0 +1,37 @@
+module.exports = {
+  root: true,
+  env: {
+    browser: true,
+    node: false,
+    es6: true,
+    jquery: true,
+  },
+  globals: {
+    google: true,
+    document: true,
+    navigator: false,
+    window: true,
+    prestashop: true,
+  },
+  extends: ['airbnb-base'],
+  rules: {
+    'max-len': ['error', {code: 140}],
+    'no-underscore-dangle': 'off',
+    'no-restricted-syntax': 'off',
+    'no-param-reassign': 'off'
+  },
+  settings: {
+    'import/resolver': {
+      alias: {
+        map: [
+          ['@js', './js'],
+          ['@css', './css'],
+          ['@node_modules', './node_modules'],
+        ],
+      }
+    }
+  },
+  parserOptions: {
+    ecmaVersion: 2022
+  },
+}