docs: add use case docs

Author: g-saracca

docs/useCases.md

@@ -51,6 +51,7 @@ The different use cases currently available in the package are classified below,
   - [Files write use cases](#files-write-use-cases)
     - [File Uploading Use Cases](#file-uploading-use-cases)
     - [Delete a File](#delete-a-file)
+    - [Restrict or Unrestrict a File](#restrict-or-unrestrict-a-file)
 - [Metadata Blocks](#metadata-blocks)
   - [Metadata Blocks read use cases](#metadata-blocks-read-use-cases)
     - [Get All Facetable Metadata Fields](#get-all-facetable-metadata-fields)
@@ -1264,6 +1265,28 @@ Note that the behavior of deleting files depends on if the dataset has ever been
 - If the dataset has published, the file is deleted from the draft (and future published versions).
 - If the dataset has published, the deleted file can still be downloaded because it was part of a published version.
 
+#### Restrict or Unrestrict a File
+
+Restrict or unrestrict an existing file.
+
+##### Example call:
+
+```typescript
+import { restrictFile } from '@iqss/dataverse-client-javascript'
+
+/* ... */
+
+const fileId = 12345
+
+restrictFile.execute(fileId)
+
+/* ... */
+```
+
+_See [use case](../src/files/domain/useCases/RestrictFile.ts) implementation_.
+
+The `fileId` parameter can be a string, for persistent identifiers, or a number, for numeric identifiers.
+
 ## Metadata Blocks
 
 ### Metadata Blocks read use cases