Added Readme

Readme.md

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+AGPM Injector
+=============
+##### This is a AGPM (Apple Graphics Power Management) Injector kext generator.
+
+#### Installation
+- Select the SMBIOS you are using from the dropdown menu and click Generate. the AGPMInjector kext will be generated on to your Desktop.
+- Copy the AGPMInjector.kext to EFI/Clover/kexts/Other folder and reboot.
+
+#### Features
+- Fixes GPU Power Management for discrete GPUs on supported SMBIOS (Systems that are in the dropdown menu)
+- Automatically parses /System/Library/Extensions/AppleGraphicsPowerManagement.kext to generate the most up to date injector kext
+
+#### Important Information
+- X86PlatformPlugin must be loaded in or for this injector to work
+- Your GPU device must be labeled as GFX0 in order for the injector to hook into the AGPMController. This can be done by using [Lilu](https://github.com/acidanthera/Lilu) with [WhateverGreen](https://github.com/acidanthera/WhateverGreen), SSDT/DSDT property injection or by Device Properties in Clover config.plist.
+
+#### Credits
+- [toleda](https://github.com/toleda) and others for layout.