Added base readme for dust manager (space-ros#46)

custom_gz_plugins/src/DustManager/README.md

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+# Dust Manager Plugin
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+The Dust Manager plugin simulates realistic dust dynamics in Martian or space environments by controlling particle emitters. Dust is a significant factor in extraterrestrial conditions, particularly on Mars, where it can affect visibility, equipment performance, and overall mission success. This plugin allows for the accurate simulation of dust clouds, aiding in the development and testing of vehicles and systems designed for planetary exploration. By mimicking how dust interacts with moving objects, the plugin helps create more realistic and challenging simulation scenarios for space missions.
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