Update server README to explain how to install pip
Update server README to explain how to install pip

Purdue-ACM-SIGAPP/SafeWalk,Purdue-ACM-SIGAPP/SafeWalk,Purdue-ACM-SIGAPP/SafeWalk,Purdue-ACM-SIGAPP/SafeWalk,Purdue-ACM-SIGAPP/SafeWalk,Purdue-ACM-SIGAPP/SafeWalk