added migrated 2.x add-ons

Signed-off-by: Kai Kreuzer <kai@openhab.org>

bundles/org.openhab.binding.serialbutton/README.md

@@ -0,0 +1,45 @@
+# Serial Button Binding
+
+This is a binding for probably one of the simplest devices possible: A simple push button which short-cuts two pins on a serial port.
+
+## Supported Things
+
+The binding defines a single thing type called `button`.
+
+A button requires the single configuration parameter `port`, which specifies the serial port that should be used. 
+
+The only available channel is a `SYSTEM_RAWBUTTON` channel called `button`, which emits `PRESSED` events (no `RELEASED` events though) whenever data is available on the serial port (which will be read and discarded).
+
+The use case is simple: Connect any push button to pins 2 and 7 of an RS-232 interface as short-cutting those will signal that data is available.
+Using the default toggle profile, this means that you can use this channel to toggle any Switch item through the button.
+
+## Full Example
+
+demo.things:
+
+```
+serialbutton:button:mybutton "My Button" [ port="/dev/ttyS0" ]
+```
+
+demo.items:
+
+```
+Switch MyLight { channel="serialbutton:button:mybutton:button" }
+```
+
+_Note:_ This is a trigger channel, so you will most likely bind a second (state) channel to your item, which will control your physical light, so you might end up with the following, if you want to use your button with a Hue bulb:
+
+```
+Switch MyLight { channel="hue:0210:1:bulb1:color,serialbutton:button:mybutton:button" }
+```
+
+demo.sitemap:
+
+```
+sitemap demo label="Main Menu"
+{
+    Frame {
+        Switch item=MyLight label="My Light"
+    }
+}
+```