Docs: Kokkoja in five minutes

docs/introduction.md

@@ -146,6 +146,8 @@ view first, since the host sees the same screen and has a few more
 buttons, then from the host's, and finally explains how it works
 underneath, for those who want to run their own server or read the code.
 
+* [Kokkoja in five minutes](quickstart.md), the shortest path for
+  someone at home in a terminal
 * [A guest's Kokkoja](guest.md)
 * [A host's Kokkoja](host.md)
 * [How Kokkoja works](implementation.md)