[yocto] [meta-raspberrypi][PATCH 5/5] README: Document new variable configuration

[Theodor Gherzan]

From: Theodor Gherzan <theodor at resin.io>

Signed-off-by: Theodor Gherzan <theodor at resin.io>
---
 README | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/README b/README
index 536926b..cbc7a92 100644
--- a/README
+++ b/README
@@ -233,6 +233,10 @@ the modelname should be added as a MACHINE_FEATURES in local.conf like below:
 List of currently supported models:
     - pitft22
 
+3.O. Enable UART
+===============
+Set this variable to enable UART:
+ENABLE_UART = "1"
 
 4. Extra apps
 =============
-- 
2.1.4