Add logging / utils package (optimizely#226)

Author: jordangarcia

Diff for: .prettierrc

@@ -0,0 +1,10 @@
+{
+  "printWidth": 89,
+  "tabWidth": 2,
+  "useTabs": false,
+  "semi": false,
+  "singleQuote": true,
+  "trailingComma": "all",
+  "bracketSpacing": true,
+  "jsxBracketSameLine": false
+}