examples: add pull progress readme

examples/pull-progress/README.md

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+# pull-progress
+
+This example emulates `ollama pull` using the Python library and [`tqdm`](https://tqdm.github.io/).
+
+## Setup
+
+```shell
+pip install -r requirements.txt
+```

examples/pull-progress/main.py

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-# pip install tqdm
-
 from tqdm import tqdm
 from ollama import pull
 

examples/pull-progress/requirements.txt

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+tqdm==4.66.1