Add link to ruma-client in README

Author: zecakeh

README.md

@@ -1,6 +1,7 @@
 # Ruma Examples
 
-These are example projects showcasing how to use the various [Ruma] crates.
-You can use these as a base for starting your own project.
+These are example projects showcasing how to use [ruma-client] and the various
+[Ruma] crates. You can use these as a base for starting your own project.
 
+[ruma-client]: https://github.com/ruma/ruma-client
 [Ruma]: https://github.com/ruma/ruma