Add preliminary gitignore
Add preliminary gitignore

aik/SLOF,qemu/SLOF,open-power-host-os/slof,stefanberger/SLOF-tpm,agraf/SLOF,qemu/SLOF,open-power-host-os/slof,stefanberger/SLOF-tpm,leilihh/SLOF,mdroth/SLOF,agraf/SLOF,agraf/SLOF,k0da/SLOF,leilihh/SLOF,aik/SLOF,k0da/SLOF,mdroth/SLOF,k0da/SLOF,dgibson/SLOF,leilihh/SLOF,stefanberger/SLOF-tpm,mdroth/SLOF,dgibson/SLOF,open-power-host-os/slof,dgibson/SLOF,agraf/SLOF,k0da/SLOF,leilihh/SLOF,dgibson/SLOF,open-power-host-os/slof,mdroth/SLOF,aik/SLOF,qemu/SLOF