#2041: Add RST doc

docs/source/simulation_components/system/ntp_client_server.rst

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+
+    © Crown-owned copyright 2023, Defence Science and Technology Laboratory UK
+
+NTP Client Server
+=================
+
+NTP Server
+----------
+The ``NTPServer`` provides a NTP Server simulation by extending the base Service class.
+
+NTP Client
+----------
+The ``NTPClient`` provides a NTP Client simulation by extending the base Service class.
+
+Key capabilities
+^^^^^^^^^^^^^^^^
+
+- Simulates NTP requests and NTPPacket transfer across a network
+- Leverages the Service base class for install/uninstall, status tracking, etc.
+
+Usage
+^^^^^
+- Install on a Node via the ``SoftwareManager`` to start the database service.
+- Service runs on TCP port 123 by default.
+
+Implementation
+^^^^^^^^^^^^^^
+
+- NTP request and responses use a ``NTPPacket`` object
+- Extends Service class for integration with ``SoftwareManager``.
+
+NTP Client
+----------
+
+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 TCP 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.