Add Gio talk

Author: eliasnaur

EliasNaur-SimplePortableAndEfficientGraphicalInterfaces/README.md

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+# Simple, Portable and Efficient Graphical Interfaces in Go
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+Slides are on go-talks.appspot.com [here](https://go-talks.appspot.com/github.com/eliasnaur/gophercon-2019-talk/gophercon-2019.slide).
+The example programs and slide source are [here](https://github.com/eliasnaur/gophercon-2019-talk).
+
+The Gio project: [gioui.org](https://gioui.org).
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+The Scatter messaging program: [scatter.im](https://scatter.im).
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+Elias Naur
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+- GitHub: [@eliasnaur](https://github.com/eliasnaur)
+- Twitter: [@elias_naur](https://twitter.com/elias_naur)
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