Added .gitignore to ignore vim swap, undo, and backup files.

Signed-off-by: Lizhou Sha <slz@mit.edu>

diff --git a/.gitignore b/.gitignore
new file mode 100644 (file)
index 0000000..f9987b7
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,4 @@
+# Backup files, swap files, etc.
+*~
+*.un~
+*.swp