Add Python demo and move demos to their own subdir

README.md

@@ -13,4 +13,5 @@ particular, HTTP response codes are ignored (see #1).
     git clone https://git.kj7rrv.com/kj7rrv/netrun
     cd netrun
     pip3 install -r requirements.txt
-    python3 netrun.py https://git.kj7rrv.com/kj7rrv/netrun/raw/branch/master/demo_script.sh
+    python3 netrun.py https://git.kj7rrv.com/kj7rrv/netrun/raw/branch/master/demos/shell.sh
+    python3 netrun.py --interpreter=python3 https://git.kj7rrv.com/kj7rrv/netrun/raw/branch/master/demos/python.py

demos/python.py

@@ -0,0 +1,13 @@
+#!/usr/bin/env python3
+import platform
+import textwrap
+import os
+
+language = f"Python {platform.python_version()}"
+operating_system = f"{platform.system()} {platform.release()}"
+machine = f"a system with a(n) {platform.processor()} processor"
+
+message = f"You are running {language} on {operating_system} on {machine}."
+
+for line in textwrap.wrap(message, os.get_terminal_size().columns):
+    print(line)