Merge branch 'Sprint/2021-16' into 'master'

Sprint/2021 16

See merge request !47

README.md

 ## Tree
 
 The TreeApi handles the retrieving or storing metadata to a certain path.
+

src/Tree/Controllers/TreeController.cs

@@ -149,8 +149,8 @@ namespace Coscine.Api.Tree.Controllers
                             {
                                 Name = GetFolderOrFileName(x),
                                 Path = x.Key,
-                                Size = (int)x.BodyBytes,
-                                Kind = x.Key[(x.Key.LastIndexOf(".") + 1)..],
+                                Size = x.BodyBytes,
+                                Kind = x.HasBody ? "file" : "folder",
                                 Provider = resource.Type.DisplayName
                             };
                             var objectMetaInfoReturnObject = new ObjectMetaInfoReturnObject(objectMetaInfo, _blobApiLink, resource.Id.ToString());