refactor(docu): add demo example calls

README.md

@@ -68,47 +68,51 @@ _The following steps show how to get the SDK running_
       var config = ApplicationConfigLoader.loadConfig("absolute/path/to/config.yml");
       var senderClient = ClientFactory.senderClient(config);
       ````
-
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-
-### External Configuration
-
-Configuration properties e.g. for REST-API urls and proxy settings can be found in the YAML config ``config.yml`` within the root folder of the project.
-
-In order to run the SDK client a configuration needs to be provided as file in the same path as the jar (e.g. when the commandline client is used) or via reference using the environment variable ``FIT_CONNECT_CONFIG`` (e.g. when the SDK is used programmatically).
-
+   
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 ## Usage
 
-#### Sending
+### Hand in new submission
 
 ```java
+ClientFactory.senderClient(config)
+        .newSubmission()
+        .withAttachment(Path.of("path/to/attachment.txt").toFile()) // optional
+        .withJsonData("{ foo: 'bar'}")
+        .withDestination(UUID.fromString("destinationId"))
+        .withServiceType("TestService", "Führerscheinbeantragung",  "urn:de:fim:leika:leistung:99400048079000")
+        .submit();
+```
 
-List<File> attachments = ... // Load e.g from local file system
-        
-        ClientFactory.senderClient()
-        .withDestination(UUID.randomUUID())
-        .withServiceType("ServiceName", "leika:key:service")
-        .withAttachments(attachments)
-        .withJsonData("{ caseSpecific: 'Data' }")
+### Hand in already encrypted submission (e.g. from frontend)
+
+```java
+ClientFactory.senderClient(config)
+        .newSubmissionWithEncryptedData("$encrpyt€ed d@t@")
+        .withEncryptedAttachment(UUID.fromString("attachmentId"), "$encrpyt€ed @tt@chment")
+        .withEncryptedJsonData("{$encrpyt€ed json}")
+        .withEncryptedMetadata("$encrpyt€ed metadata")
+        .withDestination(UUID.fromString("destinationId"))
+        .withServiceType("TestService", "Führerscheinbeantragung",  "urn:de:fim:leika:leistung:99400048079000")
         .submit();
 ```
 
-#### Subscribing
+### Retrieve public encryption key
 
 ```java
+Optional<String> jweKey =  ClientFactory.subscriberClient(config).getPublicKey(UUID.fromString("destinationId"));
+```
 
-    var client = ClientFactory.subscriberClient();
+### List all submissions for a destination
 
-    var submissions = client.getAvailableSubmissions(destinationId);
-    
-    var submissionId = ... // filter submission list for requested one ...      
-            
-    var submission = client.requestSubmission(submissionId)
-    submission.getAttachments();
-    submission.getMetadata();
-    submission.getData();
+```java
+Set<SubmissionForPickup> submissions =  ClientFactory.subscriberClient(config).getAvailableSubmissions(UUID.fromString("destinationId"));
+```
+### Receive single submission
+
+```java
+Optional<ReceivedSubmission> submission =  ClientFactory.subscriberClient(config).requestSubmission(UUID.fromString("destinationId"));
 ```
 
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