Move up the redis installation instructions to the top of the README.#2662

SongmingFan123 wants to merge 2 commits intomasterPolicyEngine/policyengine-api:masterfrom

Move-up-the-redis-installation-instructions-to-the-top-of-the-READMEPolicyEngine/policyengine-api:Move-up-the-redis-installation-instructions-to-the-top-of-the-READMECopy head branch name to clipboard