Initial commit.

README.md

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+## CustomGroupbox
+[Groupbox with content in the header]
+
+## Features
+[feature highlights]
+
+## Usage
+[step by step instructions]
+
+## Demo project
+[link to sandbox]
+
+## Issues, suggestions and feature requests
+[link to GitHub issues]
+
+## Development and contribution
+[specify contribute]