[http] Document translation services need to be installed before usage (#16363)

* Update README.md

Signed-off-by: Li-Wen Yip <liwen.yip@gmail.com>
Signed-off-by: Ciprian Pascu <contact@ciprianpascu.ro>
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Li-Wen Yip 2024-03-02 22:01:24 +11:00 committed by Ciprian Pascu
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@ -66,6 +66,9 @@ When concatenating the `baseURL` and `stateExtension` or `commandExtension` the
### Value Transformations (`stateTransformation`, `commandTransformation`)
Transformations can be used if the supplied value (or the required value) is different from what openHAB internal types require.
The relevant transformation service needs to be installed via the Main UI or addons.cfg before use.
Here are a few examples to unwrap an incoming value via `stateTransformation` from a complex response:
| Received value | Tr. Service | Transformation |