add .editorconfig & .gitattributes

.editorconfig

@@ -0,0 +1,11 @@
+root = true
+
+[*]
+trim_trailing_whitespace = true
+insert_final_newline = true
+charset = utf-8
+indent_style = tab
+indent_size = tab
+
+[*.{markdown,md}]
+trim_trailing_whitespace = false

.gitattributes

@@ -0,0 +1 @@
+* text=auto linguist-detectable