Revert "RM Resourcespace - doent look to be free anymore"

This reverts commit dbfd014578.

README.md

@@ -972,6 +972,7 @@ _Related: [Groupware](#groupware)_
 - [Gossa](https://github.com/pldubouilh/gossa) - Gossa is a light and simple webserver for your files. `MIT` `Go`
 - [IFM](https://github.com/misterunknown/ifm) - Single script file manager. `MIT` `PHP`
 - [miniserve](https://github.com/svenstaro/miniserve) - CLI tool to serve files and dirs over HTTP. `MIT` `Rust`
+- [ResourceSpace](https://www.resourcespace.com) - ResourceSpace open source digital asset management software is the simple, fast, and free way to organise your digital assets. ([Demo](https://www.resourcespace.com/trial), [Source Code](https://www.resourcespace.com/svn)) `BSD-4-Clause` `PHP`
 - [s3server](https://github.com/jessfraz/s3server) - Simple HTTP interface to index and browse files in a public S3 or Google Cloud Storage bucket. `MIT` `Go`
 - [Surfer](https://git.cloudron.io/cloudron/surfer) - Simple static file server with webui to manage files. `MIT` `Nodejs`
 - [TagSpaces](https://www.tagspaces.org/) - TagSpaces is an offline, cross-platform file manager and organiser that also can function as a note taking app. The WebDAV version of the application can be installed on top of a WebDAV servers such as Nextcloud or ownCloud. ([Demo](https://demo.tagspaces.com), [Source Code](https://github.com/tagspaces/tagspaces)) `AGPL-3.0` `Nodejs`