[docs] Create content_model_spec.md

.github/ISSUE_TEMPLATE/content_model_spec.md

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+---
+name: Content Model Specification
+about: Use this template when you are specifying proposed changes to the CMS Content Model
+title: "Content model specification for [PRODUCT/FEATURE]"
+labels: Content Model
+assignees: ''
+
+---
+
+## User Story or Problem Statement
+
+AS A Drupal Engineer
+I NEED detailed guidance on the proposed content model for [PRODUCT/FEATURE]
+SO THAT I can implement it in Drupal
+
+## Description or Additional Context 
+
+
+## Steps for Implementation
+
+
+## Acceptance Criteria
+- [ ] Proposed entities, fields, and field properties are documented using the [content model spec template](https://github.com/department-of-veterans-affairs/va.gov-team/blob/master/platform/cms/content-model/drupal_content_model_spec_template.xlsx)
+- [ ] Reviewed with engineering & product
+- [ ] Send to CMS Collab Cycle
+
+
+## Team
+Please check the team(s) that will do this work.
+
+- [ ] CMS Team
+- [ ] Public Websites
+- [ ] Facilities
+- [ ] Accelerated Publishing