add example how you can get the hwModel using api

examples/get_hw.py

@@ -0,0 +1,20 @@
+"""Simple program to demo how to use meshtastic library.
+   To run: python examples/get_hw.py
+"""
+
+import sys
+import meshtastic
+import meshtastic.serial_interface
+
+# simple arg check
+if len(sys.argv) != 1:
+    print(f"usage: {sys.argv[0]}")
+    print("Print the hardware model for the local node.")
+    sys.exit(3)
+
+iface = meshtastic.serial_interface.SerialInterface()
+if iface.nodes:
+    for n in iface.nodes.values():
+        if n['num'] == iface.myInfo.my_node_num:
+            print(n['user']['hwModel'])
+iface.close()