feat: add .editorconfig

Author: franklinkim

.editorconfig

@@ -0,0 +1,16 @@
+# EditorConfig helps developers define and maintain consistent
+# coding styles between different editors and IDEs
+# editorconfig.org
+
+root = true
+
+[*]
+# Change these settings to your own preference
+indent_size = 2
+indent_style = space
+
+# We recommend you to keep these unchanged
+charset = utf-8
+end_of_line = lf
+insert_final_newline = true
+trim_trailing_whitespace = true