Add spikard to Micro Frameworks

README.md

 * [Minicli](https://github.com/minicli/minicli) - Minimalist, dependency-free framework for building CLI-centric PHP applications.
 * [Silly](https://github.com/mnapoli/silly) - A micro-framework for CLI applications.
 * [Slim](https://www.slimframework.com/) - Another simple micro framework.
+* [spikard](https://github.com/Goldziher/spikard) - Rust-powered polyglot HTTP framework with type-safe routing, tower middleware, and OpenAPI/GraphQL/JSON-RPC codegen (PHP binding over a Rust core).
 
 ### Micro Framework Extras
 *Extras related to micro frameworks and routers.*