add installation notes for CUDA 12.4, pyenv, and PyTorch; include useful links

notes/cuda-12-4-install.md

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+# CUDA 12.4 Install
+
+> https://unknowndba.blogspot.com/2024/04/cuda-getting-started-on-wsl.html (@\_freddenis\_, 2024)
+
+```bash
+# get md5sums
+wget https://developer.download.nvidia.com/compute/cuda/12.4.1/docs/sidebar/md5sum.txt
+#
+# setup cuda apt repo
+wget https://developer.download.nvidia.com/compute/cuda/repos/wsl-ubuntu/x86_64/cuda-wsl-ubuntu.pin
+sudo mv cuda-wsl-ubuntu.pin /etc/apt/preferences.d/cuda-repository-pin-600
+#
+# download installer and check md5sum
+wget https://developer.download.nvidia.com/compute/cuda/12.4.1/local_installers/cuda-repo-wsl-ubuntu-12-4-local_12.4.1-1_amd64.deb
+md5sum --check --ignore-missing md5sum.txt
+#
+# try to install cuda (this will fail, but it puts the keyring file in the correct spot)
+sudo dpkg -i cuda-repo-wsl-ubuntu-12-4-local_12.4.1-1_amd64.deb
+#
+# copy cuda gpg keyring to keyrings 
+sudo cp /var/cuda-repo-wsl-ubuntu-12-4-local/cuda-*-keyring.gpg /usr/share/keyrings/
+#
+# install cuda (this time for real)
+sudo dpkg -i cuda-repo-wsl-ubuntu-12-4-local_12.4.1-1_amd64.deb
+#
+# install cuda-toolkit
+sudo apt update
+sudo apt install cuda-toolkit-12-4
+#
+# setup path
+# sudo apt install plocate
+locate nvcc
+# -> returns /usr/local/cuda-12.4
+# add these lines to your .profile (.zshrc, ...)
+#
+# export PATH="/usr/local/cuda-12.4/bin:$PATH"
+# export LD_LIBRARY_PATH="/usr/local/cuda-12.4/lib64:$LD_LIBRARY_PATH"
+#
+# after source-ing, check version of nvcc
+nvcc -V
+```
+
+## check cuda installation with cuda samples
+
+```bash
+git clone https://github.com/NVIDIA/cuda-samples
+cd cuda-samples/Samples/1_Utilities/deviceQuery
+make
+./devicequery
+```
+
+
+### if the cuda-toolkit install fails with unmet dependencies
+
+>https://askubuntu.com/a/1493087 (jspinella, 2023, CC BY-SA 4.0)
+
+1. Open the *new* file for storing the sources list
+
+    ```bash
+    sudo nano /etc/apt/sources.list.d/ubuntu.sources
+    ```
+
+2. Paste in the following at the end of the file: 
+
+    ```raw
+    Types: deb
+    URIs: http://archive.ubuntu.com/ubuntu/
+    Suites: lunar
+    Components: universe
+    Signed-By: /usr/share/keyrings/ubuntu-archive-keyring.gpg
+    ```
+
+3. Save the file and run `sudo apt update` - now the install command for CUDA should work.
+