.gitignore: Add IDE/editor ignores.

BUG=None
TEST=None

Change-Id: Ifc703a944a0751689662fee07da9cc7322546997
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/overlays/portage-stable/+/2278483
Tested-by: Alex Klein <saklein@chromium.org>
Auto-Submit: Alex Klein <saklein@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Commit-Queue: Mike Frysinger <vapier@chromium.org>
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..c00af21
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,8 @@
+# Local eng changes to text editor config shouldn't show up in `git status`
+# and shouldn't be git add-able unless explictly running `git add -f file`
+/.dir-locals.el
+/.idea/
+/.exrc
+/.nvimrc
+/.vimrc
+/.vscode/