feat: add simple linking to the examples

Signed-off-by: MBWhite <[email protected]>

site/docs/tutorial/examples.md

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+# Code samples and examples
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+It's very useful to have examples of how APIs are used; both to get information on teh best practicses for using APIs and ideas of how they can be used. 
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+Each language binding is intended to contain examples that are relavent to that language. Hoped that this list will grow over time, new submissions always welcome.
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+## Java
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+- [Substrait-Spark](https://github.com/substrait-io/substrait-java/tree/main/examples/substrait-spark) this demonstrates how Substrait plans can be created and consumed within Apache Spark. The examples run within a simple Spark cluster of a couple of docker containers.
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