Update README.md (bkaradzic#3244)

Added reference to DiskBoard in the "Who is using it?" section

README.md

@@ -579,6 +579,12 @@ Survive the onslaught.
 target="_blank"><img src="http://img.youtube.com/vi/UioR5ptCFYU/0.jpg" 
 alt="WARCANA Announcement Trailer" width="640" height="480" border="0" /></a>
 
+## DiskBoard
+
+https://www.diskboard.com - DiskBoard is the ultimate tool that can help you measure the performance and monitor the health of your hardware. All of your devices are presented in a clean and easy to understand view. The tests offer extensive customization options, allowing you to simulate various workloads. The intuitive visuals provide clear insights, benchmark comparisons, and performance guidelines. Join a community of tech enthusiasts, compare your device's prowess, and witness your hardware shine!
+
+![Diskboard screenshot](https://www.diskboard.com/assets/diskboard3.png)
+
 [License (BSD 2-clause)](https://bkaradzic.github.io/bgfx/license.html)
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