Add Minimal README.md to examples

examples/python/README.md

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+# Python examples
+The following examples showcase how to use OrTools.
+These examples should work for both Python2.7+ and Python3.5+.
+
+We recommend that all projects you create target `Python 3.7`,
+as this allows you to keep up-to-date with the latest Python frameworks.
+
+Wherever you have `ortools` package installed, be sure to import it from your python file.
+
+# Execution
+For running the examples you can use the the following command:
+```shell
+python -m pip install --upgrade --user ortools
+python <example>.py
+```