feat: add issue templates for bug reports and feature requests

Author: Ardenexal

.github/ISSUE_TEMPLATE/bug_report.yml

@@ -0,0 +1,90 @@
+name: Bug Report
+description: Report a bug or unexpected behaviour
+labels: ["bug", "triage"]
+body:
+  - type: dropdown
+    id: component
+    attributes:
+      label: Component
+      description: Which component is affected?
+      options:
+        - CodeGeneration
+        - Serialization
+        - Models (generated)
+        - FHIRPath
+        - FHIRBundle (Symfony)
+        - Other / Unsure
+    validations:
+      required: true
+
+  - type: dropdown
+    id: fhir-version
+    attributes:
+      label: FHIR Version
+      description: Which FHIR version are you working with?
+      options:
+        - R4
+        - R4B
+        - R5
+        - Not applicable
+    validations:
+      required: true
+
+  - type: textarea
+    id: description
+    attributes:
+      label: Description
+      description: A clear and concise description of the bug.
+      placeholder: What happened?
+    validations:
+      required: true
+
+  - type: textarea
+    id: steps
+    attributes:
+      label: Steps to Reproduce
+      description: Minimal steps to reproduce the behaviour.
+      placeholder: |
+        1. Run command '...'
+        2. Pass this input '...'
+        3. See error
+    validations:
+      required: true
+
+  - type: textarea
+    id: expected
+    attributes:
+      label: Expected Behaviour
+      description: What did you expect to happen?
+    validations:
+      required: true
+
+  - type: textarea
+    id: actual
+    attributes:
+      label: Actual Behaviour
+      description: What actually happened? Include error messages or stack traces if applicable.
+    validations:
+      required: true
+
+  - type: textarea
+    id: environment
+    attributes:
+      label: Environment
+      description: |
+        Please provide your environment details.
+      value: |
+        - PHP version:
+        - Symfony version:
+        - Package version:
+        - OS:
+    validations:
+      required: true
+
+  - type: textarea
+    id: additional
+    attributes:
+      label: Additional Context
+      description: Any other context, screenshots, or log output that might help.
+    validations:
+      required: false

.github/ISSUE_TEMPLATE/config.yml

@@ -0,0 +1,5 @@
+blank_issues_enabled: false
+contact_links:
+  - name: Questions & Discussions
+    url: https://github.com/ardenexal/FHIR-Structure-Definition-php-generator/discussions
+    about: Ask questions and discuss ideas in GitHub Discussions

.github/ISSUE_TEMPLATE/feature_request.yml

@@ -0,0 +1,66 @@
+name: Feature Request
+description: Suggest a new feature or improvement
+labels: ["enhancement", "triage"]
+body:
+  - type: dropdown
+    id: component
+    attributes:
+      label: Component
+      description: Which component does this relate to?
+      options:
+        - CodeGeneration
+        - Serialization
+        - Models (generated)
+        - FHIRPath
+        - FHIRBundle (Symfony)
+        - New component
+        - Other / Unsure
+    validations:
+      required: true
+
+  - type: dropdown
+    id: fhir-version
+    attributes:
+      label: FHIR Version
+      description: Which FHIR version does this relate to, if any?
+      options:
+        - R4
+        - R4B
+        - R5
+        - All versions
+        - Not applicable
+    validations:
+      required: true
+
+  - type: textarea
+    id: problem
+    attributes:
+      label: Problem Statement
+      description: What problem does this feature solve? Describe the use case or pain point.
+      placeholder: I'm trying to ... but currently ...
+    validations:
+      required: true
+
+  - type: textarea
+    id: solution
+    attributes:
+      label: Proposed Solution
+      description: Describe what you'd like to happen. Include code examples or API sketches if relevant.
+    validations:
+      required: true
+
+  - type: textarea
+    id: alternatives
+    attributes:
+      label: Alternatives Considered
+      description: Any alternative solutions or workarounds you've considered.
+    validations:
+      required: false
+
+  - type: textarea
+    id: additional
+    attributes:
+      label: Additional Context
+      description: Any other context, mockups, or references that might help.
+    validations:
+      required: false