[WIP] Update TWP style guide

Author: Kenji Shimizu

.prettierignore

@@ -0,0 +1 @@
+README.md

.prettierrc.json

@@ -0,0 +1,16 @@
+{
+  "semi": true,
+  "tabWidth": 2,
+  "singleQuote": true,
+  "printWidth": 120,
+  "bracketSpacing": false,
+  "indentSchema": true,
+  "overrides": [
+    {
+      "files": ["**/*.liquid"],
+      "options": {
+        "singleQuote": false
+      }
+    }
+  ]
+}