standalone in docs

Author: steam0r

md/4_export_embed/dev_embed/export_standalone/export_standalone.md

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+# Export for Cables Standalone Version
+
+Select the "Standalone" option in the export dialog. Download the latest version of ["cables standalone"](https://cables.gl/downloads).
+
+Install and/or open the standalone version, select "Open Patch" from the menu or the welcome screen, select
+the `.json` file you just downloaded. Start patching!
+
+Be aware, that there is currently no way to re-import patches that you worked on in "cables standalone"
+to cables.gl. This will be in one of the next releases!
+
+Have a look at [our roadmap](https://github.com/cables-gl/cables_electron/milestones?direction=desc&sort=due_date&state=open) for future versions and [report bugs](https://github.com/cables-gl/cables_electron/issues) or submit [feature requests](https://github.com/cables-gl/cables_electron/issues). Any feedback is greatly appreciated!