python: Add 'requirements.txt'

Change-Id: Ic7ef47bbef8879d6235ef669ff39a17f602f5cfd
Issue-on: https://gem5.atlassian.net/browse/GEM5-1268
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/62632
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>
Tested-by: kokoro <noreply+kokoro@google.com>
Maintainer: Jason Lowe-Power <power.jg@gmail.com>
Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>
1 file changed