Prettier config added.

Author: ryoldash

reactjs/.prettierignore

@@ -0,0 +1,5 @@
+**/*.md
+**/*.svg
+**/*.ejs
+**/*.html
+package.json

reactjs/.prettierrc

@@ -0,0 +1,11 @@
+{
+    "singleQuote": true,
+    "trailingComma": "es5",
+    "printWidth": 150,
+    "overrides": [{
+        "files": ".prettierrc",
+        "options": {
+            "parser": "json"
+        }
+    }]
+}