[Feature Request] : There should be a .claudeignore file

It would make sense to have a .claudeignore file that will ignore all the other files that are not added as part of the context else there will be very little control the developer can have over what file the agent chooses to send over to the server.

This can typically help with workflows that have sensitive files, code files containing sensitive data or otherwise just in general to be a good practice to create a pattern where I first work with files A B and C and thats my universe then after completing these I move on to the files that are downstream like DepsA/ DepsB/ and so on. This will help me code in a natural flow without having to bash my head in with too much data problem.