Update README.md to include how to set temperature

llms/README.md

@@ -64,6 +64,29 @@ prompt = tokenizer.apply_chat_template(
 text = generate(model, tokenizer, prompt=prompt, verbose=True)
 ```
 
+To use temperature or other sampler arguments pass it like this
+
+```
+from mlx_lm import load, generate
+
+model, tokenizer = load("mlx-community/Mistral-7B-Instruct-v0.3-4bit")
+
+temp: 0.7
+top_p: 0.9
+top_k: 25
+sampler = make_sampler(temp, top_p,top_k)
+
+prompt = "Write a story about Ada Lovelace"
+
+messages = [{"role": "user", "content": prompt}]
+prompt = tokenizer.apply_chat_template(
+    messages, add_generation_prompt=True
+)
+
+text = generate(model, tokenizer, prompt=prompt, sampler, verbose=True)
+
+```
+
 To see a description of all the arguments you can do:
 
 ```