Adds a .editorconfig to keep code style similar on supporting configurations. (#1167)

.editorconfig

@@ -0,0 +1,11 @@
+# Editor configuration, see https://editorconfig.org
+root = true
+
+[*.kt]
+charset = utf-8
+end_of_line = lf
+indent_size = 4
+indent_style = space
+insert_final_newline = true
+trim_trailing_whitespace = true
+