Instructions to list implementations (#500)

Author: Acconut

src/pages/implementations.astro

@@ -159,8 +159,7 @@ const communityServerImplementations = await getCollection(
   </ul>
 
   <p>
-    Drop a line if you built an open source tus implementation, and you'll be
-    listed here.
+    Do you have an implementation that's not listed here? Add your work by opening a pull requests against the [website's repository](https://github.com/tus/tus.io/tree/main/src/content/implementations)!
   </p>
 
   <style>