Hello and welcome to LinuxQuestions,
If I recall correctly there should be a .bashrc file in /etc or in /etc/skel, so you can copy that to your home directory like this:
cp /etc/.bashrc ~/ (or from /etc/skel/.bashrc)
Of course that's the default bashrc, you have lost whatever is in your 'deleted' version of the file. If you have a backup of your system (recent) you can restore it from there.