docs: update Ecosystem.md (fastify#4551)

* docs: update Ecosystem.md

* docs: new line Ecosystem.md

Author: Adibla

docs/Guides/Ecosystem.md

@@ -537,6 +537,8 @@ section.
 - [`fastify-server-session`](https://github.com/jsumners/fastify-server-session)
   A session plugin with support for arbitrary backing caches via
   `fastify-caching`.
+- [`fastify-shared-schema`](https://github.com/Adibla/fastify-shared-schema) Plugin
+  for sharing schemas between different routes.
 - [`fastify-slonik`](https://github.com/Unbuttun/fastify-slonik) Fastify Slonik
   plugin, with this you can use slonik in every part of your server.
 - [`fastify-slow-down`](https://github.com/nearform/fastify-slow-down) A plugin 
@@ -628,7 +630,6 @@ section.
   and lightweight Sequelize plugin for Fastify.
 - [`typeorm-fastify-plugin`](https://github.com/jclemens24/fastify-typeorm) A simple
   and updated Typeorm plugin for use with Fastify.
-
 #### [Community Tools](#community-tools)
 - [`@fastify-userland/workflows`](https://github.com/fastify-userland/workflows)
   Reusable workflows for use in the Fastify plugin