Add power management script and update README.md instructions

-Updated to OpenCore 1.0.0

-Updated to OpenCore 0.9.8

Merge branch 'master' of https://github.com/SquarePeace/ThinkPadL470-…

…OpenCoreEFI

-Updated to OpenCore 0.9.4

-Updated to OpenCore 0.9.2

Update README.md

-Updated to OpenCore 0.8.6

-Updated to OpenCore 0.8.5

-Updated to OpenCore 0.8.4