git-ignore transient files created by aidegen

Bug: b/285895312
Test: verified files are ignored by git
Change-Id: I8e80469079de80ac548418570dabdd0f432dd2a9
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..bff2d76
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+*.iml