Add testimonial from david gillard

Author: davidtgillard

_testimonials/david-gillard.md

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+---
+id: david-gillard
+bullets:
+- '**David Gillard**'
+- Software Technical Lead
+- C-CORE
+keywords: []
+quote: Overall, F# made our development work faster and more reliable.
+---
+Choosing F# for our satellite transponder project was an excellent decision. Strong static typing and the built-in units of measure enabled our small team to implement quickly and focus on domain modeling and validation of the implementation. The runtime efficiency allowed us to carry out a larger proportion of development in F#, restricting our native code to the hard real-time aspects of the system. A slower scripted language would have necessitated more implementation in a lower-level language. Plus, having access to the .NET ecosystem was a major advantage. Overall, F# made our work faster and more reliable. If you're considering a technology stack for a scientific domain where correctness is a major objective, you should look to F#.