Adding section to README file

[wavingtowaves]

• Documentation reference (URL): https://github.com/ess-dive-community/essdive-hydrologic-monitoring
• Submitter: Rob
• Justification (why is this change necessary?): Adding a new section to inform visitors any changes to the reporting format between versions

I suggest the following changes:

I suggest that we add a new section to the README file which aligns with what some of the recently published RFs have on their page. It's a section that informs readers what updates were made between (for example) v1.0.0 and v1.0.1. For now, we can just have a placeholder like the one below. This can go below the 'getting started' section.

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Updates in v1.0.0

This is the first release of the Hydrologic Monitoring Reporting Format reporting format.