added line in .gitignore file for ignoring .idea/files.

Author: Tejas-Sangani

.gitignore

@@ -25,6 +25,9 @@ hs_err_pid*
 # 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/
+.idea/*
+
 # User-specific stuff
 .idea/**/workspace.xml
 .idea/**/tasks.xml