README: Add a note on compiling qboot

Signed-off-by: Kashyap Chamarthy <kchamart@redhat.com>
Message-Id: <1432561354-26220-1-git-send-email-kchamart@redhat.com>
["make" is enough. - Paolo]
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
diff --git a/README b/README
index 9baba33..a06391b 100644
--- a/README
+++ b/README
@@ -22,6 +22,20 @@
   Right now only flash is supported. 350 ms are saved, bringing the startup
   time down to 60 ms.
 
+Compile qboot
+=============
+
+Clone the source:
+
+    $ git clone https://github.com/bonzini/qboot.git
+
+Compile the qboot firmware (you may need to install the relevant build
+time dependancies):
+
+    $ make
+
+The result will be a 64K file named bios.bin.
+
 Usage
 =====