add prettier for consistent formatting

Author: janstoff

.prettierignore

@@ -0,0 +1,2 @@
+node_modules
+dist

.prettierrc

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+{
+  "printWidth": 100,
+  "trailingComma": "none",
+  "tabWidth": 2,
+  "semi": true,
+  "singleQuote": true,
+  "bracketSpacing": true,
+  "bracketSameLine": false,
+  "arrowParens": "always",
+  "endOfLine": "auto",
+  "jsxSingleQuote": false,
+  "proseWrap": "always",
+  "quoteProps": "consistent",
+  "useTabs": false,
+  "htmlWhitespaceSensitivity": "css"
+}