handle partially quantized models (#76)

* handle partially quantized models

- fix for #53 #71 #69 #74
- in order to test the models
	- I added a default prompt of an appropriate form
	- while working on the model configuration also added additional stop tokens (#74)
- fixed the repetitionPenalty code (#71)

mlx-swift-examples.xcodeproj/project.xcworkspace/xcshareddata/swiftpm/Package.resolved

@@ -16,7 +16,7 @@
       "location" : "https://github.com/ml-explore/mlx-swift",
       "state" : {
         "branch" : "main",
-        "revision" : "3c802c808d281c191d5f26f37a4f93135d8ca119"
+        "revision" : "d6d9472da5bf7ec2654e8914bd1d15622f45b6a9"
       }
     },
     {
@@ -61,7 +61,7 @@
       "location" : "https://github.com/gonzalezreal/swift-markdown-ui",
       "state" : {
         "branch" : "main",
-        "revision" : "723249a1ba361042812cf785244de94f11f7c8fd"
+        "revision" : "c0daf6eb79d97964180f3113868c990bd1c4a007"
       }
     },
     {