more file/dir cleanup

diff --git a/.gitignore b/.gitignore
index ba4c541..c85b669 100644
--- a/.gitignore
+++ b/.gitignore
@@ -26,4 +26,9 @@ $RECYCLE.BIN/
 # Windows shortcuts
 *.lnk

-# End of https://www.gitignore.io/api/windows
\ No newline at end of file
+# End of https://www.gitignore.io/api/windows
+
+btm/
+btm/*
+.gitattributes
+