minor: Update README.md with system diagram #148
Merged
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Which issue does this PR close?
Closes #.
Rationale for this change
A high level system diagram often helps people quickly understand what a project is and how it relates to other proejects.
@sunchao made a nice diagram for how Comet and Spark relate to each other for the blog post we are working on in apache/arrow-site#479 / apache/arrow-site#479 (comment) and I think that image would be valuable in the main README as well
What changes are included in this PR?
How are these changes tested?
You can see how it renders here: https://github.com/alamb/arrow-datafusion-comet/tree/alamb/docs