Documentation: Document how to transfer files from QEMU to the host

Document how to transfer files from QEMU to the host

Documentation/TransferringFiles.md

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+# Transferring files from QEMU to your host machine
+
+## Method 1: WebServer
+Serenity has a built-in web server which extends to your host machine.
+
+Open a new terminal and use the following command to start a WebServer instance for the current working directory:
+
+```console
+ws .
+```
+
+Then we just open `localhost:8000` on our host machine :^)
+
+![](WebServer_localhost.png)
+
+**NOTE:** Due to the fact that same browsers download unrecognized files as plain text, you may want to use something like `wget` to download the file **as is** instead. Otherwise the file may appear corrupted when the system tries to load it.
+
+## Method 2: Mount disk_image
+
+Another way is to mount Serenity's disk_image to your host machine by using the following command on *nix systems:
+
+```console
+cd "Build/${SERENITY_ARCH}"
+mkdir mnt
+sudo mount -t ext2 _disk_image mnt
+```