readme: getting started how to quit qemu on top

cirosantilli · cirosantilli · commit e26942999565 · 2018-08-23T14:14:45.000+01:00
diff --git a/README.adoc b/README.adoc
@@ -64,6 +64,14 @@ hello2 cleanup
 
 which are `printk` messages from `init` and `cleanup` methods of those modules.
 
+Quit QEMU with:
+
+....
+Ctrl-A X
+....
+
+See also: <<text-mode>>.
+
 Source:
 
 * link:kernel_module/hello.c[]
