Adding this schema on schema store to enable easy bootstrap in editors

[remyleone]

https://github.com/SchemaStore/schemastore/blob/master/CONTRIBUTING.md#how-to-include-a-ref-to-an-external-schema

[bflad]

Hi @remyleone 👋 Thank you for raising this. When we get closer to releasing the first general availability schema definition in the coming months, we can consider if/where might make sense to publish it. I'm guessing as part of that effort, it will be establishing stable URLs on developer.hashicorp.com for that purpose.