Set up tools and working environment

.eslintrc.json

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+{
+    "env": {
+      "browser": true,
+      "es6": true,
+      "jest": true
+    },
+    "parser": "babel-eslint",
+    "parserOptions": {
+      "ecmaVersion": 2018,
+      "sourceType": "module"
+    },
+    "extends": ["airbnb-base"],
+    "rules": {
+      "no-shadow": "off",
+      "no-param-reassign": "off",
+      "eol-last": "off",
+      "import/extensions": [ 1, {
+        "js": "always", "json": "always"
+      }]
+    },
+    "ignorePatterns": [
+      "dist/",
+      "build/"
+    ]
+  }
+

.gitignore

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+# .gitignore
+node_modules/

.hintrc

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+{
+    "connector": {
+      "name": "local",
+      "options": {
+        "pattern": ["**", "!.git/**", "!node_modules/**"]
+      }
+    },
+    "extends": ["development"],
+    "formatters": ["stylish"],
+    "hints": [
+      "button-type",
+      "disown-opener",
+      "html-checker",
+      "meta-charset-utf-8",
+      "meta-viewport",
+      "no-inline-styles:error"
+    ]
+  }

.stylelintrc.json

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+{
+    "extends": ["stylelint-config-standard"],
+    "plugins": ["stylelint-scss", "stylelint-csstree-validator"],
+    "rules": {
+      "at-rule-no-unknown": null,
+      "scss/at-rule-no-unknown": true,
+      "csstree/validator": true
+    },
+    "ignoreFiles": ["build/**", "dist/**", "**/reset*.css", "**/bootstrap*.css", "**/*.js", "**/*.jsx"]
+  }
+