OSX-KVM - October 2021 Batch Update

Changes:

- Add Makefile to improve usability (thiagokokada)

- Typo fix (cclauss)

- Update to OpenCore-0.7.4 (via Nick)

OpenCore/README.md

@@ -0,0 +1,38 @@
+### Notes
+
+Catalina installs the same way as Mojave.
+
+Tested with macOS Big sur with OpenCore-0.7.4-RELEASE.zip release in October,
+2021.
+
+Note: Use `create_iso_catalina.sh` for generating a macOS Catalina based "ISO"
+(actually DMG) image.
+
+Attention: Use 64-bit Ubuntu 20.04 LTS or later as the host OS for "best"
+results. Guestfish output results may vary across platforms.
+
+```
+# Normal OpenCore Image
+rm -f OpenCore.qcow2; sudo ./opencore-image-ng.sh --cfg config.plist --img OpenCore.qcow2
+```
+
+Note: https://github.com/thenickdude/KVM-Opencore is one of the best resources
+for customizing `OpenCore.qcow2`. Thanks Nick! :)
+
+### Links
+
+* https://github.com/acidanthera/OpenCorePkg/releases
+
+* https://github.com/williambj1/OpenCore-Factory/releases
+
+* https://opencore.slowgeek.com/ (neat!)
+
+* https://github.com/chris1111/USB-3.0-NEC/releases (thanks Chris!)
+
+* https://github.com/khronokernel/Opencore-Vanilla-Desktop-Guide/blob/master/clover-conversion/clover-efi.md
+
+* https://insanelymacdiscord.github.io/Getting-Started-With-OpenCore/
+
+* https://dortania.github.io/Anti-Hackintosh-Buyers-Guide/
+
+* https://dortania.github.io/OpenCore-Desktop-Guide/troubleshooting/debug.html