Add Sonoff RM433 conf example (#1150)

conf/sonoff_rm433.conf

@@ -0,0 +1,20 @@
+# Sonoff RM433 remote controller
+# https://www.itead.cc/sonoff-rm433-remote-controller-base.html
+
+# map the 8 buttons to A->H
+# Each remote controller has its own ID (2 first bytes)
+
+decoder {
+    name=Sonoff-RM433,
+    modulation=OOK_PWM,
+    short=260,
+    long=744,
+    reset=8000,
+    gap=800,
+    tolerance=50,
+    bits>=24,
+    invert,
+    get=@0:{20}:id,
+    get=@20:{4}:button:[8:A 12:B 4:C 9:D 2:E 5:F 1:G 3:H],
+    unique
+}