Add mtools package information. Ref https://github.com/GNS3/gns3-gui/issues/3076

README.rst

@@ -24,8 +24,9 @@ In addition of Python dependencies listed in a section below, other software may
 * `Dynamips <https://github.com/GNS3/dynamips/>`_ is required for running IOS routers (using real IOS images) as well as the internal switches and hubs.
 * `VPCS <https://github.com/GNS3/vpcs/>`_ is recommended, it is a builtin node simulating a very simple computer to perform connectitivy tests using ping, traceroute etc.
 * Qemu is strongly recommended on Linux, as most node types are based on Qemu, for example Cisco IOSv and Arista vEOS.
-* libvirt is recommended (Linux only), as it's needed for the NAT cloud
+* libvirt is recommended (Linux only), as it's needed for the NAT cloud.
 * Docker is optional (Linux only), some nodes are based on Docker.
+* mtools is recommended to support data transfer to/from QEMU VMs using virtual disks.
 * i386-libraries of libc and libcrypto are optional (Linux only), they are only needed to run IOU based nodes.
 
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