Add .editorconfig

Author: mspirkov

.editorconfig

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

.gitattributes

@@ -1,6 +1,7 @@
 /.github/ export-ignore
 /examples/ export-ignore
 /tests/ export-ignore
+/.editorconfig export-ignore
 /.gitattributes export-ignore
 /.gitignore export-ignore
 /.yamllint.yaml export-ignore