Create xmus.md

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+xemu allows inserting XMUs (Xbox Memory Units) to controller hubs.
+
+This is done by using a file as the storage medium. Any file bigger than 1 MiB in size should work.
+
+
+## Creating the XMU
+
+Open up the Monitor, and type in these commands:
+
+```
+drive_add 0 if=none,id=usbdisk1,file="your_filename"
+stop
+device_add usb-storage,drive=usbdisk1,port=1.3.2
+cont
+```
+
+and replace "your_filename" with a path to your XMU file.
+
+You may additionally change the controller you're inserting this XMU to.
+
+Replace the value of `port` with `1.x.2` where x is one of `3, 4, 1, 2` for players `1, 2, 3, 4` respectively.
+
+## Creating an XMU file
+The XMU file may be any file that's bigger than 1 MiB. If you don't want to sacrifice another file, you may create one with tools like `fsutil` on Windows, or `dd` on Linux:
+
+Windows:
+```
+fsutil file createnew filename size
+```
+
+Replace `filename` with your desired file name, and `size` with a size bigger than 1 MiB. For example, use `33554432` to create a 32 MiB file.
+
+Linux:
+```
+dd if=/dev/zero of=filename bs=32MB count=1
+```
+
+Same as windows