Update .gitignore for JetBrains(PyCharm) users
Update .gitignore for JetBrains(PyCharm) users

We ignore .idea directory for JetBrains(PyCharm) users
See: https://github.com/github/gitignore/blob/master/Global/JetBrains.gitignore

Change-Id: Ida6f170d389d9566638f39a411c3b252165a310b

sandvine/horizon,noironetworks/horizon,wolverineav/horizon,noironetworks/horizon,openstack/horizon,BiznetGIO/horizon,BiznetGIO/horizon,bac/horizon,NeCTAR-RC/horizon,openstack/horizon,coreycb/horizon,wolverineav/horizon,coreycb/horizon,NeCTAR-RC/horizon,sandvine/horizon,wolverineav/horizon,noironetworks/horizon,coreycb/horizon,wolverineav/horizon,openstack/horizon,ChameleonCloud/horizon,bac/horizon,bac/horizon,bac/horizon,yeming233/horizon,sandvine/horizon,sandvine/horizon,yeming233/horizon,ChameleonCloud/horizon,noironetworks/horizon,ChameleonCloud/horizon,ChameleonCloud/horizon,coreycb/horizon,NeCTAR-RC/horizon,BiznetGIO/horizon,openstack/horizon,BiznetGIO/horizon,yeming233/horizon,yeming233/horizon,NeCTAR-RC/horizon