Add pr and issue templates

Author: rubiii

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug Report
+about: Report a bug to help us improve
+labels: bug
+---
+
+### Description
+
+A clear description of what the bug is.
+
+### Steps to Reproduce
+
+1.
+2.
+3.
+
+### Expected Behavior
+
+What you expected to happen.
+
+### Actual Behavior
+
+What actually happened. Include error messages and stack traces if applicable.
+
+### WSDL Document
+
+If possible, attach or paste a minimal WSDL fixture that reproduces the issue.
+Sanitize any credentials or internal URLs before sharing.
+
+### Environment
+
+- Ruby version:
+- `wsdl` gem version:
+- SOAP version (1.1 / 1.2):
+- OS:

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature Request
+about: Suggest a new feature or improvement
+labels: enhancement
+---
+
+### Problem
+
+What problem does this feature solve? Why is it needed?
+
+### Proposed Solution
+
+Describe the feature or change you'd like to see.
+
+### Alternatives Considered
+
+Any alternative approaches you've thought about.
+
+### Additional Context
+
+Relevant WSDL snippets, links to specifications, or examples from other libraries.

.github/pull_request_template.md

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+### What
+
+Brief description of the change.
+
+### Why
+
+What problem does this solve? Link to a related issue if applicable.
+
+### How
+
+Summary of the approach taken (skip for trivial changes).
+
+### Checklist
+
+- [ ] Tests added or updated
+- [ ] `bundle exec rake ci` passes
+- [ ] Documentation updated (if public API changed)
+- [ ] Commit messages explain *why*, not just *what*