restruture old ch02 into appendix A

appendix-A/02_installing-python-libraries/README.md

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+# Libraries Used In This Workshop
+
+We will be using the following libraries in this workshop, and I highly recommend installing them before attending the event:
+
+- numpy >= 1.24.3 (The fundamental package for scientific computing with Python)
+- scipy >= 1.10.1 (Additional functions for NumPy)
+- pandas >= 2.0.2 (A data frame library)
+- matplotlib >= 3.7.1 (A plotting library)
+- jupyterlab >= 4.0 (An application for running Jupyter notebooks)
+- ipywidgets >= 8.0.6 (Fixes progress bar issues in Jupyter Lab)
+- scikit-learn >= 1.2.2 (A general machine learning library)
+- watermark >= 2.4.2 (An IPython/Jupyter extension for printing package information)
+- torch >= 2.0.1 (The PyTorch deep learning library)
+- torchvision >= 0.15.2 (PyTorch utilities for computer vision)
+- torchmetrics >= 0.11.4 (Metrics for PyTorch)
+- transformers >= 4.30.2 (Language transformers and LLMs for PyTorch)
+- lightning >= 2.0.3 (A library for advanced PyTorch features: multi-GPU, mixed-precision etc.)
+
+To install these requirements most conveniently, you can use the `requirements.txt` file:
+
+```
+pip install -r requirements.txt
+```
+
+![install-requirements](figures/install-requirements.png)
+
+Then, after completing the installation, please check if all the packages are installed and are up to date using
+
+```
+python_environment_check.py
+```
+
+![check_1](figures/check_1.png)
+
+It's also recommended to check the versions in JupyterLab by running the `jupyter_environment_check.ipynb` in this directory. Ideally, it should look like as follows:
+
+![check_1](figures/check_2.png)
+
+If you see the following issues, it's likely that your JupyterLab instance is connected to wrong conda environment:
+
+![jupyter-issues](figures/jupyter-issues.png)
+
+
+In this case, you may want to use `watermark` to check if you opened the JupyterLab instance in the right conda environment using the `--conda` flag:
+
+![watermark](figures/watermark.png)