docs(federation): 📝 Update SDK documentation

packages/sdk/entities/entity.ts

@@ -0,0 +1,17 @@
+import { EntitySchema } from "../schemas/entity.ts";
+import type { JSONObject } from "../types.ts";
+
+export class Entity {
+    public static name = "Entity";
+
+    // biome-ignore lint/suspicious/noExplicitAny: This is a base class that is never instanciated directly
+    public constructor(public data: any) {}
+
+    public static fromJSON(json: JSONObject): Promise<Entity> {
+        return EntitySchema.parseAsync(json).then((u) => new Entity(u));
+    }
+
+    public toJSON(): JSONObject {
+        return this.data;
+    }
+}