added EditorConfig file

.editorconfig

@@ -0,0 +1,20 @@
+# EditorConfig helps developers define and maintain consistent
+# coding styles between different editors and IDEs
+# EditorConfig is awesome: https://EditorConfig.org
+
+root = true
+
+
+[*]
+end_of_line = lf
+charset = utf-8
+insert_final_newline = true
+indent_style = tabs
+indent_size = 4
+
+[*.txt]
+indent_style = tab
+indent_size = 4
+
+[*.{diff,md}]
+trim_trailing_whitespace = false