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[http] Add examples (#9540) 

Signed-off-by: Jan N. Klug <jan.n.klug@rub.de>
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## Vito WIFI (https://github.com/openhab/openhab-addons/issues/9480#issuecomment-751335696)
### .things
```
Thing http:url:vitowifi "VitoWifi" @ "1stfloor" [baseURL="http://192.168.1.61/", commandMethod="POST", delay="1000", refresh="90", timeout="900"] {
Channels:
Type number : Channel_Vito_ID "Vito_ID" [ stateExtension="read?DP=0x00f8&Type=CountS", stateTransformation="REGEX:(^[-+]?[0-9]+)" ]
Type number : Channel_Vito_Mode "Vito_Mode" [ stateExtension="read?DP=0xb000&Type=Mode", stateTransformation="REGEX:(^[-+]?[0-9]+)", commandExtension="write?DP=0xb000&Type=Mode&Value=%2$s" ]
Type number : Channel_Vito_OnOff "Vito_OnOff_for_ESPEasy" [ stateExtension="control?cmd=Status,GPIO,12", stateTransformation="JSONPATH(state)",commandExtension="control?cmd=GPIO,12,%2$s"]
}
```
### .items
```
Number Vito_ID "Vito_ID" <switch> (gHeating) {channel="http:url:vitowifi:Channel_Vito_ID" , expire="5m" }
Number Vito_Mode "Vito_Mode" <switch> (gHeating) {channel="http:url:vitowifi:Channel_Vito_Mode" , expire="5m" }// 0= Off 1= WW 2= WW+heat 0x42 (66)=party
Number Vito_OnOff "ONOFF Switch" <switch> (gHeating) {channel="http:url:vitowifi:Channel_Vito_OnOff" , expire="5m" }
```
## Feinstaubsensor (https://community.openhab.org/t/http-binding-openhab-3-version/101851/235)
The http request http://feinstaubsensor-14255834/data.json is answering with a JSON string.
So I need some simple JSONPATH transformation and one java script transformation.
Data is polled every 10 seconds.
### .things
```
Thing http:url:feinstaub "Feinstaub" [ baseURL="http://feinstaubsensor-14255834/data.json", refresh=10] {
Channels:
Type number : SDS_PM10 [ stateTransformation="JSONPATH:$.sensordatavalues[0].value" ]
Type number : SDS_PM25 [ stateTransformation="JSONPATH:$.sensordatavalues[1].value" ]
Type number : Temperatur [ stateTransformation="JSONPATH:$.sensordatavalues[2].value" ]
Type number : Pressure [ stateTransformation="JS:airpressure.js" ]
Type number : Humidity [ stateTransformation="JSONPATH:$.sensordatavalues[4].value" ]
}
```
### .items
```
/* **************************
* Feinstaub sensor data
* ************************** */
Number N_FS_SDS_PM10 "Partikelgröße 10µm [%.2f µg/m³]" { channel="http:url:feinstaub:SDS_PM10" }
Number N_FS_SDS_PM25 "Partikelgröße 2.5µm [%.2f µg/m³]" { channel="http:url:feinstaub:SDS_PM25" }
Number N_FS_Temperatur "Temperatur [%.2f °C]" <temperature> { channel="http:url:feinstaub:Temperatur" }
Number N_FS_Pressure "Luftdruck [%.2f hPa]" <pressure> { channel="http:url:feinstaub:Pressure" }
Number N_FS_Humidity "Luftfeuchte [%.2f %%]" <water> { channel="http:url:feinstaub:Humidity" }
```
### airpressure.js (transformation)
I have a BME2080 sensor connected. The Humidity must be diveded by 100 to show hPa.
```
(function(x) {
var json = JSON.parse(x);
return json.sensordatavalues[3].value/100;
})(input)
```