README doc update

[bennettm]

Description

This is a simple README.md instructions change.

Fixes # (issue)
N/A

Type of change

Please delete options that are not relevant.
N/A

How Has This Been Tested?

N/A

Checklist:

• I have performed a self-review of changes to README.md

[bennettm]

@RuaridhMacd, got to use the new pull request template, which is exciting. Take a look and let me know if you have any questions.

[RuaridhMacd]

@bennettm Thanks Mary. I'll take a look today.
I noticed that the templates are not assigning themselves to the MacroEnergy/DOLPHYN project. I think I needed to wrap the string in an array. I'll make a PR to try resolve it.