docs(standard): add resource tagging standard

docs/style/resource-tagging.md

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+# Resource Tagging Conventions
+
+## Standard Default Tags
+
+These are the default standard tags that are created and expected through our metadata module. Standard default tags are always proper case and allow them to be visualized in the AWS console.
+
+- Component
+- Contact
+- Description
+- Domain
+- Environments
+- Organization
+- System
+- Team
+
+## General Convention For New Tags
+
+For tags that are not the standard default tags, use the following convention:
+
+1. Use kebab case follow by colon
+2. Use lowercase for all the words
+3. Use `:` to help identify that the resource is associated with the prefix
+4. Should not contain any personal identifiable information (PII)
+
+Example:
+
+```aws
+backup:required = true
+backup:enabled = true
+
+pii = true
+pii:description = some description
+pii:contact-team = platform
+pii:contact = [email protected]
+```
+
+## Reference
+
+- [What Are Tags?](https://docs.aws.amazon.com/whitepapers/latest/tagging-best-practices/what-are-tags.html)
+- [Tagging Best Practices](https://docs.aws.amazon.com/whitepapers/latest/tagging-best-practices/tagging-best-practices.html)
+- [Tagging Standards](https://docs.aws.amazon.com/whitepapers/latest/establishing-your-cloud-foundation-on-aws/tagging-standards.html)