Update editor config rules for style consistency

Author: mitogh

.editorconfig

@@ -0,0 +1,14 @@
+root=true
+
+[*]
+charset=utf-8
+end_of_line=lf
+insert_final_newline=true
+trim_trailing_whitespace=true
+
+[*.js]
+indent_style=space
+indent_size=2
+
+[*.md]
+trim_trailing_whitespace = false