chore: Add .editorconfig

.editorconfig

@@ -0,0 +1,16 @@
+# EditorConfig helps define and maintain consistent
+# coding styles between different editors and IDEs.
+# http://editorconfig.org/
+
+root = true
+
+[*]
+charset = utf-8
+indent_size = 2
+end_of_line = lf
+indent_style = space
+insert_final_newline = true
+trim_trailing_whitespace = true
+
+[*.md]
+trim_trailing_whitespace = false