Add editor formatting config

.editorconfig

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

.eslintrc.json

@@ -0,0 +1,16 @@
+{
+  "root": true,
+  "parser": "@typescript-eslint/parser",
+  "env": {
+    "node": true
+  },
+  "plugins": [
+    "@typescript-eslint"
+  ],
+  "extends": [
+    "eslint:recommended",
+    "plugin:@typescript-eslint/eslint-recommended",
+    "plugin:@typescript-eslint/recommended",
+    "plugin:prettier/recommended"
+  ]
+}

.prettierrc.json

@@ -0,0 +1,6 @@
+{
+  "trailingComma": "es5",
+  "semi": true,
+  "singleQuote": true,
+  "tabWidth": 2
+}