Added HoloNET (c# client) link to bottom

[dellams]

Summary

Others may find this useful if building on windows since c# is a very popular language for windows (and mac and Linux) development and is used in Unity game engine and in a lot of business enterprise development worldwide...

TODO:

• CHANGELOG(s) updated with appropriate info
• Just before pressing the merge button, ensure new entries to CHANGELOG(s) are still under the UNRELEASED heading

[height]

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