There is no example for the Sonoff s20 Smart Socket. So I make one.

Sonoff-S20-Smart-Socket.md

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+* Itead Product Page: http://sonoff.itead.cc/en/products/residential/s20-socket
+* Itead Wiki: https://www.itead.cc/wiki/S20_Smart_Socket
+
+## Serial Connection
+
+Please see the [Hardware Preparation](https://github.com/arendst/Sonoff-Tasmota/wiki/Hardware-Preparation) page for general instructions.
+
+### Step 1.
+
+Be sure it is **NOT** plugged in!
+
+Remove the "hidden" screw.
+
+<img alt="SonoffSC" src="https://www2.pic-upload.de/img/34211427/back-first-screw.jpg" width="230" />
+
+### Step 2. (optional)
+
+Remove the board so you can access the GND,TXD,RXD,VCCIO better.
+There are 2 screws. At the Red and the Blue cable. Be careful not to damage the soldered connection!
+
+<img alt="SonoffSC" src="https://www2.pic-upload.de/img/34211425/inside.jpg" width="230" />
+
+### Step 3.
+
+Connect the jumper cables.
+
+<img alt="SonoffSC" src="https://www2.pic-upload.de/img/34211430/inside-connected.jpg" width="230" />
+
+When holding the socket from top to bottom.
+
+O   - GND
+
+O   - RXD
+
+O   - TXD
+
+[O] - VCCIO
+
+Connected?
+Hold the little button pressed while connecting the USB cable to your Notebook, PC etc.
+after ca. 2 sec. let go of the button.
+It is now in flashing mode.
+Follow the [Hardware Preparation](https://github.com/arendst/Sonoff-Tasmota/wiki/Hardware-Preparation) page for general instructions.