Build: add options; editorconfig, prettier

Author: gitgitWi

.editorconfig

@@ -0,0 +1,21 @@
+# http://editorconfig.org
+root = true
+
+[*]
+indent_style = space
+indent_size = 2
+end_of_line = lf
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true
+
+[*.json]
+insert_final_newline = ignore
+
+[**.min.js]
+indent_style = ignore
+insert_final_newline = ignore
+
+[*.md]
+trim_trailing_whitespace = false
+

.prettierrc

@@ -0,0 +1,7 @@
+{
+  "tabWidth": 2,
+  "useTabs": false,
+  "endOfLine": "lf",
+  "printWidth": 90,
+  "trailingComma": "es5"
+}