add .editorconfig to ensure we use tabs, not spaces

diff --git a/.editorconfig b/.editorconfig
new file mode 100644 (file)
index 0000000..31252bc
--- /dev/null
+++ b/.editorconfig
@@ -0,0 +1,3 @@
+# see https://editorconfig.org for more options, and setup instructions for yours editor
+
+indent_style = tab