Merge pull request #1 from koobs/patch-1

Create README.md

README.md

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+Development version of kvmclock FreeBSD driver for virtual machines.
+
+### References and prior art
+
+ * [RedHat: Virtualization Deployment and Administration Guide -- Chapter 8. KVM Guest Timing Management](https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/virtualization_deployment_and_administration_guide/chap-kvm_guest_timing_management)
+ * [VMWare: Timekeeping in VMware Virtual Machines (Information Guide, PDF)](https://www.vmware.com/files/pdf/techpaper/Timekeeping-In-VirtualMachines.pdf)
+ * [Pitfalls of TSC usage -- 3.3 TSC emulation on different hypervisors (2015-09-09,  Oliver Yang)](https://oliveryang.net/2015/09/pitfalls-of-TSC-usage/#33-tsc-emulation-on-different-hypervisors)
+ * [FreeBSD Review D29531: Add kvmclock timecounter support to FreeBSD](https://reviews.freebsd.org/D29531)
+ * [FreeBSD Bug #216759: Memory speed with small blocks (1K) up to 35 times slower than host system (under QEMU)](https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=216759)