Update README

README.md

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 # firmament: 🌄 Challenge of building operating system (reffering to MikanOS)
+## Setup
+1. Build container on Visual Studio Code.
+2. Run: `cd ~/edk2; source edksetup.sh`
+## Utils
+### Build
+* Run: `cd ~/edk2; build`
+### Make disk
+* Run: `sudo ~/make_disk.sh`
+### Run QEMU (uses VcXsrv; please configure it before running this)
+* Run: `~/run_qemu.sh`