Added new .editorconfig for configuration of coding style.

.editorconfig

@@ -0,0 +1,14 @@
+root = true
+
+# Default for all files
+[*]
+indent_style = space
+indent_size = 4
+end_of_line = lf
+insert_final_newline = true
+trim_trailing_whitespace = true
+charset = utf-8
+
+# YAML
+[*.{yml,yaml}]
+indent_size = 2