Update REST API.md

Author: makoni

Documentation/REST API.md

@@ -1,6 +1,7 @@
 # Upload API
 
 * [Initialization](#initialization)
+* [Get list of files](#get-list-of-files-api-reference)
 
 
 ### Initialization
@@ -9,3 +10,58 @@ REST API requires both public and secret key:
 ```swift
 let uploadcare = Uploadcare(withPublicKey: "YOUR_PUBLIC_KEY", secretKey: "YOUR_SECRET_KEY")
 ```
+### Get list of files ([API Reference](https://uploadcare.com/api-refs/rest-api/v0.6.0/#operation/filesList?utm_source=github&utm_medium=referral&utm_campaign=uploadcare-swift)) ###
+
+```swift
+// Make query object
+let query = PaginationQuery()
+    .stored(true)
+    .ordering(.sizeDESC)
+    .limit(5)
+// Make files list object
+let filesList = uploadcare.list()
+
+// Get files list
+filesList.get(withQuery: query) { (list, error) in
+    if let error = error {
+        print(error)
+        return
+    }
+			
+    print(list ?? "")
+}
+```
+Get next page:
+```swift
+// check if next page is available
+guard filesList.next != nil else { return }
+// get next page
+filesList.nextPage { (list, error) in
+    if let error = error {
+        print(error)
+        return
+    }	
+    print(list ?? "")
+}
+```
+
+Get previous page:
+```swift
+// check if previous page is available
+guard filesList.previous != nil else { return }
+// get next page
+filesList.previousPage { (list, error) in
+    if let error = error {
+        print(error)
+        return
+    }	
+    print(list ?? "")
+}
+```
+
+
+
+
+
+
+