MARP-795: Add README_DE

sftp-connector-product/README_DE.md

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+Axon Ivy's **SFTP Konnektor** unterstützt dich dabei, sicheren Dateitransfer in deine Arbeitsabläufe integriert. Mit diesem SFTP-Client kannst du einfach und sicher Dateien zu einem Remote-Computer übertragen und von dort empfangen. 
+
+Dieser Konnektor:
+
+- verwendet das SFTP-Protokoll
+- basiert auf [JSch](http://www.jcraft.com/jsch/) zur Handhabung der SFTP-Verbindungen und -Operationen
+- ist eine Java-Implementierung von SSH2
+- ermöglicht es dir, eine Verbindung zu einem sshd-Server herzustellen und Port-Weiterleitung, X11-Weiterleitung, Dateitransfer usw. zu nutzen
+- macht es einfach, sicheren Dateitransfer in deine Arbeitsabläufe zu integrieren
+
+
+## Demo
+
+1. Click on **File to Upload** and select one file from your local directory.
+
+   ![Upload-File](images/Upload-File.png)
+
+   Path: Sftp/SftpUploadFile -> uploadFile(fileToBeUploaded, filename)
+
+   Description: this operation will upload the file to the root path on the server.
+
+   Parameters: 
+
+               - fileToBeUploaded -> the file to upload as java.io.InputStream
+
+               - filename -> the file name as String
+
+
+2. Click on **Refresh** to list all the files on the remote directory.
+
+   - Select one file from the list and click on **Download**.
+
+   ![Download-File](images/Download-File.png)
+
+   Path: Sftp/SftpDownloadFile -> downloadFile(remoteFileName) Result: toFile
+
+   Description: this operation will download the file from the server.
+
+   Parameters: 
+
+               - remoteFileName -> the file name as String
+
+   Result: 
+
+               - toFile -> the File to download as java.io.File
+
+The **SftpClientDemo** HTML Dialog contains all the final operations to upload, list and download the file from/to the SFTP Server.
+
+   ![SftpClientDemo](images/SftpClientDemo.png)
+
+## Setup
+
+Before starting the demo, please make sure to have an SSH/SFTP server on your computer (respective the computer you want to access). For testing, the free
+ [Rebex Tiny SFTP Server](https://www.rebex.net/tiny-sftp-server/) is recommended.
+1. Open the following settings in “RebexTinySftpServer.exe.config” with a text editor and update the following values:
+   ![RebexTinySftpServer.exe.config](images/RebexTinySftpServer.exe.config.png)
+
+2. Open the `configuration/variables.yaml` in your Designer and update the following global variables:
+
+   ```
+
+   Variables:
+
+     com.axonivy.connector.sftp.server:
+       # The host name to the SFTP server
+       host: 'localhost'
+
+       # The password to the SFTP server
+       password: pwd
+
+       # The port number to the SFTP server
+       port: 22
+
+       # The username to the SFTP server
+       username: 'usr'
+
+   ```
+
+4. Save the changed settings.
+
+
+### Prerequisites:
+
+* Working **SFTP Server**.
+* You will also need the correct Server host name and the port number.
+