Update README.md

Author: CloudMarkers

README.md

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-# SDRuno-Plugin
-CloudMarkers Plugin for SDRuno
+# SDRunoPlugin_CloudMarkers
+
+Plugin for SDRuno (Version 1.40.2 and above).
+
+CloudMarkers is a community based frequency/marker/station manager with cloud synchronisation.
+
+![teaser](https://user-images.githubusercontent.com/79911865/109768584-6070a400-7bf9-11eb-9266-8037a0bb36f5.JPG)
+
+## Contribute
+
+Everyone is welcome to participate in the development of the plugin. For this purpose it is necessary to download the plugin project from SDRplay:
+https://github.com/SDRplay/plugins