#2257: rearrange software pages + creating a list of applications and services which is hopefully a single point that should be referred to

docs/source/simulation_components/system/services/ftp_server.rst

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+.. only:: comment
+
+    © Crown-owned copyright 2023, Defence Science and Technology Laboratory UK
+
+FTPServer
+=========
+Provides a FTP Client-Server simulation by extending the base Service class.
+
+Key capabilities
+^^^^^^^^^^^^^^^^
+
+- Simulates FTP requests and FTPPacket transfer across a network
+- Allows the emulation of FTP commands between an FTP client and server:
+    - STOR: stores a file from client to server
+    - RETR: retrieves a file from the FTP server
+- Leverages the Service base class for install/uninstall, status tracking, etc.
+
+Usage
+^^^^^
+- Install on a Node via the ``SoftwareManager`` to start the FTP server service.
+- Service runs on FTP (command) port 21 by default. (TODO: look at in depth implementation of FTP PORT command)
+
+Implementation
+^^^^^^^^^^^^^^
+
+- FTP request and responses use a ``FTPPacket`` object
+- Extends Service class for integration with ``SoftwareManager``.