Add GO Feature Flag to Miscellaneous (#3931)

Co-authored-by: Kieran <32241933+KieranRobson@users.noreply.github.com>
Co-authored-by: nodiscc <nodiscc@gmail.com>

README.md

@@ -1332,6 +1332,7 @@ Software that does not fit in another section.
 - [DOMJudge](https://www.domjudge.org/) - A system for running a programming contest, like the ICPC regional and world championship programming contests. ([Demo](https://www.domjudge.org/demo), [Source Code](https://github.com/DOMjudge/domjudge)) `GPL-2.0/BSD-3-Clause/MIT` `PHP`
 - [F-Droid](https://f-droid.org) - Server tools for maintaining an F-Droid repository system. ([Source Code](https://gitlab.com/fdroid/fdroidserver)) `AGPL-3.0` `Python/Docker`
 - [Flagsmith](https://flagsmith.com) - Flagsmith provides a dashboard, API and SDKs for adding Feature Flags to your applications. Alternative to LaunchDarkly. ([Source Code](https://github.com/flagsmith/flagsmith)) `BSD-3-Clause` `Docker`
+- [GO Feature Flag](https://gofeatureflag.org) - Simple, complete, and lightweight feature flag solution. Alternative to LaunchDarkly. ([Source Code](https://github.com/thomaspoignant/go-feature-flag)) `MIT` `Go`
 - [google-webfonts-helper](https://github.com/majodev/google-webfonts-helper) `⚠` - Hassle-Free Way to Self-Host Google Fonts. Get eot, ttf, svg, woff and woff2 files + CSS snippets. ([Demo](https://gwfh.mranftl.com/fonts)) `MIT` `Nodejs`
 - [Gophish](https://getgophish.com/) - Gophish is a powerful, open-source phishing framework that makes it easy to test your organization's exposure to phishing. ([Source Code](https://github.com/gophish/gophish)) `MIT` `Go/Docker`
 - [graph-vl](https://github.com/verifid/graph-vl) - Identity document verification using Machine Learning and GraphQL. `MIT` `Python`