restruture old ch02 into appendix A

appendix-A/01_optional-python-setup-preferences/README.md

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+# Python Setup Tips
+
+
+
+There are several different ways you can install Python and set up your computing environment. Here, I am illustrating my personal preference. 
+
+(I am using computers running macOS, but this workflow is similar for Linux machines and may work for other operating systems as well.)
+
+
+
+## 1. Download and install Miniforge
+
+Download miniforge from the GitHub repository [here](https://github.com/conda-forge/miniforge).
+
+<img src="figures/download.png" alt="download" style="zoom:33%;" />
+
+Depending on your operating system, this should download either an `.sh` (macOS, Linux) or `.exe` file (Windows). 
+
+For the `.sh` file, open your command line terminal and execute the following command
+
+```bash
+sh ~/Desktop/Miniforge3-MacOSX-arm64.sh
+```
+
+where `Desktop/` is the folder where the Miniforge installer was downloaded to. On your computer, you may have to replace it with `Downloads/`.
+
+<img src="figures/miniforge-install.png" alt="miniforge-install" style="zoom:33%;" />
+
+Next, step through the download instructions, confirming with "Enter".
+
+## 2. Create a new virtual environment
+
+After the installation was successfully completed, I recommend creating a new virtual environment called `dl-fundamentals`, which you can do by executing
+
+```bash
+conda create -n LLMs python=3.10
+```
+
+<img src="figures/new-env.png" alt="new-env" style="zoom:33%;" />
+
+Next, activate your new virtual environment (you have to do it every time you open a new terminal window or tab):
+
+```bash
+conda activate dl-workshop
+```
+
+<img src="figures/activate-env.png" alt="activate-env" style="zoom:33%;" />
+
+## Optional: styling your terminal
+
+If you want to style your terminal similar to mine so that you can see which virtual environment is active,  check out the [Oh My Zsh](https://github.com/ohmyzsh/ohmyzsh) project.
+
+
+
+# 3. Install new Python libraries
+
+
+
+To install new Python libraries, you can now use the `conda` package installer. For example, you can install [JupyterLab](https://jupyter.org/install) and [watermark](https://github.com/rasbt/watermark) as follows:
+
+```bash
+conda install jupyterlab watermark
+```
+
+<img src="figures/conda-install.png" alt="conda-install" style="zoom:33%;" />
+
+
+
+You can also still use `pip` to install libraries. By default, `pip` should be linked to your new `LLms` conda environment:
+
+<img src="figures/check-pip.png" alt="check-pip" style="zoom:33%;" />
+
+---
+
+
+
+
+Any questions? Please feel free to reach out in the [Discussion Forum](https://github.com/rasbt/LLMs-from-scratch/discussions).