Update unit1/dummy_agent_library.ipynb

Add instruction to activate tokens to run the notebook

unit1/dummy_agent_library.ipynb

@@ -45,6 +45,7 @@
         "from huggingface_hub import InferenceClient\n",
         "\n",
         "## You need a token from https://hf.co/settings/tokens, ensure that you select 'read' as the token type.\n",
+        "## To enable your tokens, you need to add a payment method and depositing 5$ (minimum amount) at https://huggingface.co/settings/billing. This notebook does not consume those credits."
         "## If you run this on Google Colab, add it in the \"Secrets\" tab (key icon on the left sidebar) and call it \"HF_TOKEN\".\n",
         "try:\n",
         "    from google.colab import userdata\n",