Add example json format for import into dev console

[oscargoldman]

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Description

Steps to Reproduce

Expected Result

Actual Result

Context

• [ ] Unity
• [ ] Unreal
• [ ] Other

Your Environment

• Nakama: X.X.X
• Cockroach: X.X.X
• Environment name and version:
• Operating System and version:

[oscargoldman]

Just bumping this as per Chris to add this to the docs.

https://github.com/heroiclabs/nakama/issues/347#issuecomment-494713339

[gpene]

See: https://heroiclabs.com/docs/console-overview/#importing-storage-data