Add OpenTofu (#2978)

Author: virtualroot

readme.md

@@ -408,6 +408,7 @@
 - [Slim](https://github.com/nekofar/awesome-slim#readme) - PHP framework.
 - [Fiber](https://github.com/gofiber/awesome-fiber#readme) - Web framework built on top of Fasthttp, the fastest HTTP engine for Go.
 - [Kustomize](https://github.com/DevOpsHiveHQ/awesome-kustomize#readme) - Kubernetes native declarative configuration management tool.
+- [OpenTofu](https://github.com/virtualroot/awesome-opentofu#readme) - Open-source infrastructure as code tool.
 
 ## Computer Science