Ignore IntelliJ projects. am: 911c99d6d1 am: e8cdffad32 am: 910c6338f9

Original change: https://android-review.googlesource.com/c/platform/external/minijail/+/1675745

Change-Id: If2b8b8d2efc02d42fc6c747b87fd5628110fd754
diff --git a/.gitignore b/.gitignore
index a9e0d5b..9ce33c5 100644
--- a/.gitignore
+++ b/.gitignore
@@ -46,3 +46,6 @@
 # VSCode workspace.
 minijail.code-workspace
 
+# IntelliJ projects.
+.idea
+