on Eclipse

refer to, https://github.com/NitorCreations/RobotFramework-EclipseIDE/wiki/Installation

Installing using update site

1. Start Eclipse, then select Help > Install New Software.
2. Click Add, in the top-right corner. In the Add Repository dialog that appears, enter "RobotFramework-EclipseIDE" for the Name and the following URL for the Location: http://sourceforge.net/projects/robotide/files/stable/
3. Click OK.
4. In the Available Software dialog, select the checkbox next to Robot Framework Eclipse IDE and click Next.
5. In the next window, you'll see a list of the tools to be downloaded. Click Next.
6. Read and accept the license agreements, then click Finish.
7. When the installation completes, restart Eclipse.
8. See usage for more information about configuring and using the plugin.

use

On your Maven or Gradle project Test folder,
add folder "robotframework/acceptance"
add test file "test.txt" or "test.robot"
open with "Robot Framework Textfile Editor"