#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/ntp_client.rst

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+.. only:: comment
+
+    © Crown-owned copyright 2023, Defence Science and Technology Laboratory UK
+
+NTPClient
+=========
+
+The NTPClient provides a client interface for connecting to the ``NTPServer``.
+
+Key features
+^^^^^^^^^^^^
+
+- Connects to the ``NTPServer`` via the ``SoftwareManager``.
+
+Usage
+^^^^^
+
+- Install on a Node via the ``SoftwareManager`` to start the database service.
+- Service runs on UDP port 123 by default.
+
+Implementation
+^^^^^^^^^^^^^^
+
+- Leverages ``SoftwareManager`` for sending payloads over the network.
+- Provides easy interface for Nodes to find IP addresses via domain names.
+- Extends base Service class.