Support for Spring WritableResource abstraction

[matera-jgui]

Current implementation implements the base Resource abstraction.

The implemenation of the extended WritableResource abstraction is really missing.

Although one may have a component/microservice that just reads resources, many solutions need both the read and the write capabilities.

Thanks.

[anders-swanson]

Hi @matera-jgui , thanks for the suggestion! I'll take a look and see when we can implement this feature, this sounds like a fairly simple enhancement.