Add missing intellij exclusions

Author: Paul Warren

.gitignore

@@ -75,6 +75,9 @@ local.properties
 # Covers JetBrains IDEs: IntelliJ, RubyMine, PhpStorm, AppCode, PyCharm, CLion, Android Studio and WebStorm
 # Reference: https://intellij-support.jetbrains.com/hc/en-us/articles/206544839
 
+.idea/
+**/*.iml
+
 # User-specific stuff
 .idea/**/workspace.xml
 .idea/**/tasks.xml