chore: add editorconfig file for development consistency

Author: elasticdog

.editorconfig

@@ -0,0 +1,18 @@
+# EditorConfig - http://editorconfig.org/
+
+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+indent_size = 4
+indent_style = space
+insert_final_newline = true
+trim_trailing_whitespace = true
+
+[*.md]
+indent_size = 2
+
+[bw-ssh-add]
+indent_style = tab
+tab_width = 4