examples: show how to call a simple v module from python (#13105)

examples/call_v_from_python/README.md

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+A simple example to show how to call a function written in v from python
+
+Step 1: Compile the v code to a shared library using ``v -shared -prod test.v``
+
+Step 2: Run the python file using ``python3 test.py``

examples/call_v_from_python/test.py

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+from ctypes import *
+so_file="./test.so"
+my_functions = CDLL(so_file)
+print(my_functions.square(10))

examples/call_v_from_python/test.v

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+module test
+
+[export: 'square']
+fn square(i int) int {
+	return i * i
+}