Add .editorconfig

.editorconfig

@@ -0,0 +1,19 @@
+root = true
+
+[*]
+insert_final_newline = true
+charset = utf-8
+trim_trailing_whitespace = true
+end_of_line = lf
+
+[*.{html,js,json,md,css}]
+indent_style = space
+
+[*.{html,js}]
+indent_size = 4
+
+[*.{json,md,css}]
+indent_size = 2
+
+[*.md]
+trim_trailing_whitespace = false