Please don't do a quick open source project for the sake of padding one's resume. The world is full of crap software as it is. Such software shows up in people's google searches, takes time to try out, and the user will inevitably find out that it's garbage (you can't do anything good in 2-3 months that wasn't done before if you're just learning) and not use it - but not before they wasted time to research it. Multiply it by say 10k users and you've done some serious harm in the world.

The way to go here is to absolutely code something, but not to pretend that it's a worthwhile project (e.g. don't release it under open source licence). If you put the code in a public repo somewhere so that interviers can see it, clearly state that it's just a learning excercise.