Add step for installing python

ManuSurface/ManuSurfaceSetup.md

@@ -117,6 +117,23 @@ The steps described here allow the creation of a linux system on a Surface Book
     cp ./equalizer/Default.json ~/.var/app/com.github.wwmm.easyeffects/config/easyeffects/output/
     ```
 
+  - Install python
+    ```bash
+    sudo apt install python3 python-is-python3 python3-pip
+    ```
+  - Install pyenv  
+    ```bash
+    curl https://pyenv.run | bash
+    {
+      echo ""
+      echo "# pyenv"
+      echo 'export PYENV_ROOT="$HOME/.pyenv"'
+      echo 'command -v pyenv >/dev/null || export PATH="$PYENV_ROOT/bin:$PATH"'
+      echo 'eval "$(pyenv init -)"'
+      echo 'eval "$(pyenv virtualenv-init -)"'
+    } >> ~/.bashrc
+    ```
+
 ## Post-Install
   - Add SSH-key to GitHub/Gitea websites
   - Add Caskaydia Cove Nerd Font Regular to /usr/share/font/opentype