docs: add vision and milestones for APISIX. (#7607)

Author: moonming

Vision-and-Milestones.md

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+
+### Vision
+
+Apache APISIX is an open source API gateway designed to help developers connect any APIs securely and efficiently in any environment.
+
+Managing thousands or tens of thousands of APIs and microservices in a multi-cloud and hybrid cloud environment is not an easy task.
+There will be many challenges as authentication, observability, security, etc.
+
+Apache APISIX, a community-driven project, hopes to help everyone better manage and use APIs through the power of developers.
+Every developer's contribution will used by thousands of companies and served by billions of users.
+
+### Milestones
+
+Apache APISIX has relatively complete features for north-south traffic,
+and will be iterated around the following directions in the next 6 months (if you have any ideas, feel free to create issue to discuss):
+
+- More complete support for Gateway API on APISIX ingress controller
+- Add support for service mesh
+- User-friendly documentation
+- More plugins for public cloud and SaaS services
+- Java/Go plugins and Wasm production-ready
+- Add dynamic debugging tools for Apache APISIX