Added ESLint and Prettier

.editorconfig

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+root = true
+
+[*]
+indent_style = tab
+indent_size = 2
+end_of_line = lf
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true
+max_line_length = 80
+
+[*.{yml,yaml,json}]
+indent_style = space
+indent_size = 2
+
+[*.md]
+trim_trailing_whitespace = false

.eslintrc.json

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+{
+	"parser": "babel-eslint",
+	"extends": ["airbnb", "prettier"],
+	"plugins": ["prettier", "import"],
+	"parserOptions": {
+		"sourceType": "module"
+	},
+	"env": {
+		"browser": true,
+		"es6": true,
+		"node": true
+	},
+	"rules": {
+		"prettier/prettier": ["error", { "singleQuote": true }],
+		"class-methods-use-this": 0
+	}
+}

.prettierignore

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+lib/
+package-lock.json
+package.json
+yarn.lock

.prettierrc

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+{
+  "printWidth": 80,
+  "useTabs": true,
+  "tabWidth": 2,
+  "singleQuote": true
+}