Create reference-architecture.md issue template

.github/ISSUE_TEMPLATE/reference-architecture.md

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+name: "Reference Architecture Submission"
+description: "Submit a Reference Architecture for Community Review"
+title: "[Reference Architecture: ]"
+labels: ["area/reference-architecture"]
+body:
+ - type: markdown
+   attributes:
+     value: |
+       **Purpose of This Issue**
+
+       This is a submission for a proposal of a reference architecture, as [defined here](https://github.com/cncf/tab/blob/main/process/reference-architectures.md). It should not contain the full content but a summary to evaluate its relevance to the community.
+ - type: input
+   id: name
+   attributes: 
+     label: Name
+     description: A name for this architecture submission. Suggestions include the name of the end user or domain as well as any specific area of interest (CI/CD, Edge, etc)
+     placeholder: Edge Deployments at Organization XYZ
+   validations:
+     required: true
+ - type: input
+   id: organization
+   attributes:
+     label: Organization
+     description: Architectures must be submitted by at least one CNCF Member Company
+     placeholder: List of Organizations
+   validations:
+     required: true
+ - type: textarea
+   id: teams
+   attributes:
+     label: Team(s)
+     description: Describe the teams involved in this architecture
+     placeholder: Developer Platforms, ...
+   validations:
+     required: true
+ - type: textarea
+   id: overview
+   attributes:
+     label: Overview and Goals
+     description: A brief overview of the goals of the implementation
+     placeholder: Edge deployment for sensor tracking
+   validations:
+     required: true
+ - type: textarea
+   id: projects
+   attributes:
+     label: Projects
+     description: List of projects being used in the proposed architecture (include all projects, also non CNCF projects)
+     placeholder: Kubernetes, Helm, ArgoCD, ...
+   validations:
+     required: true
+ - type: textarea
+   id: evolution
+   attributes:
+     label: Planned Evolution
+     description: Any evolution planned for this reference architecture
+     placeholder: Improvements in the area of networking and monitoring of edge devices
+   validations:
+     required: true