Add Python project examples

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

python/markov-model/input.json

@@ -0,0 +1,16 @@
+{
+  "sequence": ["A", "B", "D", "C"],
+  "nodes": 4,
+  "edges": 10,
+  "interactive": true,
+  "transition_matrix": [
+    [0.2, 0.7, 0.0],
+    [0.0, 0.0, 0.7],
+    [0.2, 0.3, 0.0]
+  ],
+  "emission_matrix": [
+    [0.7, 0.3, 0.0, 0.0],
+    [0.2, 0.2, 0.4, 0.2],
+    [0.0, 0.0, 0.2, 0.8]
+  ]
+}