Document in Readme how to work with URI params

[joshuabeny1999]

The current Readme lacks the information how to dynamic input URL Template variables provided by the thing description. I needed to reverse engineer the code to find out that the TDHTTPReqeust has additional params for that.

Here an example how i implemented the degregister Roboter part in my code using this params successfully:

    private boolean deregisterOperator(ThingDescription td, String robotUri, String token) {
        try {
            // Find the "removeOperator" action in the Thing Description
            Optional<ActionAffordance> deregisterAction = td.getActionByName("removeOperator");
            if (deregisterAction.isPresent()) {
                Optional<Form> deregisterForm = deregisterAction.get().getFirstFormForOperationType(TD.invokeAction);
                if (deregisterForm.isPresent()) {
                    // Retrieve the required input schema and prepare the payload
                    Map<String, Object> deregisterPayload = new HashMap<>();
                    deregisterPayload.put("token", token); // Replace with the actual token used during registration

                    TDHttpRequest request = new TDHttpRequest(deregisterForm.get(), TD.invokeAction, deregisterAction.get().getUriVariables().get(), deregisterPayload);

                    TDHttpResponse response = request.execute();
                    if (response.getStatusCode() == 200 || response.getStatusCode() == 204) {
                        System.out.println("Operator deregistred successfully with token: " + token);
                        return true;
                    } else {
                        System.out.println("Failed to deregister operator. HTTP status: " + response.getStatusCode());
                        return false;
                    }
                }

            }
        } catch (Exception e) {
            System.out.println("Error while deregistering operator from robot " + robotUri + ": " + e.getMessage());
        }
        return false;
    }