Create case-study-template.md

Creating the case study template.

Signed-off-by: Vaughan Knight <vaughan@vaughanknight.com>

.github/ISSUE_TEMPLATE/case-study-template.md

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+---
+name: Case-study template
+about: Case-study submissions
+title: Case-study submissions
+labels: Case-study submissions
+assignees: vaughanknight
+
+---
+
+# Case Study Template
+
+*This is a template to use for case studies that are submitted that leverage the Carbon Aware SDK. These case studies will be published to the Carbon Aware SDK repository*
+
+> We will contact the person who created this issue to follow up prior to publishing any case studies for clarification and alignment
+
+*Please delete the text in italics and replace it with the appropriate information.*
+
+*For more information on any of the items, the final reference is the [SCI Specification](https://github.com/Green-Software-Foundation/software_carbon_intensity/blob/main/Software_Carbon_Intensity/Software_Carbon_Intensity_Specification.md)*
+
+*If you find errors, or have further questions, please feel free to raise an [issue](https://github.com/Green-Software-Foundation/carbon-aware-sdk/issues).*
+
+## Overview
+
+_Please provide information describing the use case in a few bullet points_
+
+## Describe the solution that implements the Carbon Aware SDK
+
+_A textual description of the solution that implements the Carbon Aware SDK_
+
+_A textual description of the action that is taken that reduces emissiosn due to leveraging the Carbon Aware SDK_
+
+## Architecture for the solution (if applicable)
+
+_An architecture diagram of the solution described in this use case_
+
+### Technical details of the components in the architecture
+
+_Textual description with technical details of each component provided in the architecture diagram_
+
+## Carbon Aware SDK impact (both emissions impact and business impact)
+
+_Textual description of the emissions impact and how it was measured_
+
+_Textual description of the business impact beyond the emissions impact (if applicable)_
+
+## Any public press release information that relates to the 
+
+_Titles and links to press releases that can be viewed publicly online_ 
+
+## Any other notes of significance 
+
+_For example... _
+_Was the SCI used?_
+_Was this built in conjuction with another party that should be included in the case study?_
+_Was there a contribution back to the Carbon Aware SDK project as part of this?_
+_Are there any further plans to implement the Carbon Aware SDK across other solutions that can be discussed?_
+_Are there any further plans to leverage other aspects of the Green Software Foundation to drive positive impact with software?_