Improvement of the Installation and the Example

[akellne]

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Though, I could figure it out - based on the source code and the test file - it would be nice, if the Readme.md would be clearer about the installation process and the example.

For the installation add the hint:

INSTALLED_APPS = ( ... 'xorformfields', )

And in the example please add the relevant python import lines so that a copy&paste of the example leads to working code.

Thanks.