Add Python project examples

+ Neural network CLI
+ Hidden Markov Model CLI
+ K-Means clustering CLI
+ Linear regression CLI
+ Screenshots, updated README instructions

python/README.md

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+
+This directory contains a collection of Python scripts or CLI tools that I've made.
+Each of these projects provide a `requirements.txt` that can be used to 
+install the required Python packages and dependencies.
+
+To install Python 3.9 and `pip`
+
+```bash
+sudo apt install python3.9 python3-pip 
+python3.9 -m pip install -U pip
+```
+
+Additional setup instructions specific to each project provided in project README