add editor, eslint and prettier config

Author: nervehammer

.editorconfig

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+root = true
+
+[*]
+indent_style = space
+indent_size = 4
+end_of_line = lf
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true
+

.eslintignore

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+node_modules
+dist

.eslintrc.js

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+{
+    "parser": "babel-eslint",
+    "env": {
+        "browser": true,
+        "commonjs": true,
+        "es6": true,
+        "node": true
+    },
+    "extends": ["standard", "prettier", "prettier/standard"],
+    "parserOptions": {
+        "ecmaVersion": 2017,
+        "sourceType": "module"
+    },
+    "plugins": ["prettier", "standard"],
+    "rules": {
+        "no-useless-constructor": 0,
+        "no-new": 0,
+        "standard/no-callback-literal": 0,
+        "prettier/prettier": "error",
+        "indent": [
+            "error",
+            4,
+            {
+                "SwitchCase": 1
+            }
+        ],
+        "linebreak-style": ["error", "unix"],
+        "quotes": [
+            "error",
+            "single",
+            {
+                "avoidEscape": true
+            }
+        ],
+        "semi": ["error", "always"]
+    }
+}

.eslintrc.json

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+{
+  "printWidth": 120,
+  "tabWidth": 4,
+  "useTabs": false,
+  "semi": true,
+  "singleQuote": true,
+  "trailingComma": "none",
+  "bracketSpacing": false,
+  "arrowParens": "always",
+  "proseWrap": "never"
+}