Applications selected for publishing in the apps catalog meet certain criteria. There is no particular process to “send the description of a project to make it visible for the community in the GPU Application Catalog”
The best way to get your application noticed or included in the catalog is for it to be used by a larger number of people, so that it effectively becomes well-known in the community/domain that it addresses. To give an example, applications like NAMD and Gromacs are well-known and widely used in the community of molecular dynamics.
In any event, I can send your information to the curator of the catalog, however there would be no guarantee of a response, or dialog about it. If you wish to post some information here, I will make sure it gets to the catalog curator.