Updates .gitignore to exclude IDE files

Adds a new entry to .gitignore to prevent tracking of specific IDE configuration files related to the project.

This ensures a cleaner repository by excluding auto-generated files and preventing accidental commits of personal IDE settings.

Author: niemyjski

.gitignore

@@ -51,4 +51,5 @@ _NCrunch_*
 # Rider auto-generates .iml files, and contentModel.xml
 **/.idea/**/*.iml
 **/.idea/**/contentModel.xml
-**/.idea/**/modules.xml
+**/.idea/**/modules.xml
+.idea/.idea.Exceptionless.DateTimeExtensions/.idea/