add editorconfig (#1198)

* add editorconfig

* Update .editorconfig

Co-Authored-By: Lipis <lipiridis@gmail.com>

* remove duplicate section

Co-authored-by: Lipis <lipiridis@gmail.com>

.editorconfig

@@ -0,0 +1,12 @@
+# http://EditorConfig.org
+
+# top-level EditorConfig file
+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+indent_size = 2
+indent_style = space
+insert_final_newline = true
+trim_trailing_whitespace = true