Update README.md

Author: PPPDUD

README.md

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 # worldexplorer-beta
 Try out upcoming releases of WorldExplorer before they come out.
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+# How to join the beta program
+Visit https://github.com/PPPDUD/worldexplorer-beta/releases and pick a release that you might want to try. We recommend the latest version available.
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+Download the supplied .apk file and install it. Depending on how your Android is set up, you might need to change your settings to allow unknown apps.
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+That's it! You have officially become part of our beta program!
+
+# Feedback
+Note: before you send any feedback about a version of WorldExplorer, ensure that it is the latest release of WorldExplorer Beta, and ensure that it is not available already on mojavesoft.net/world banner.
+
+Since we're still testing some releases of WorldExplorer, we could seriously use some feedback and constructive criticism.
+If you have a bug report or a new feature you might enjoy, please feel free to open an issue.