Update RedisGraph README.md

[jkoontz2010]

Simple example using Cypher to CREATE a graph with relationships and then MATCH on that graph

Description

Simple starting documentation for redis/@graph

Took a while to figure out how to get started with graph

Describe your pull request here

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Checklist

• [x ] Does npm test pass with this change (including linting)?
• [x ] Is the new or changed code fully tested?
• [x ] Is a documentation update included (if this change modifies existing APIs, or introduces new ones)?

[leibale]

@jkoontz2010 thank you so much! I'll make sure someone will review it soon.

[leibale]

@jkoontz2010 sorry for the long delay :man_facepalming: review my change please?

[chayim]

WDYT about adding some boilerplate around the example, something like what we have for search?

[jonaskello]

This was helpful but hard do find :-)