docs: add Pezkuwi-SDK documentation

- Technical documentation
- SDK guides
- Architecture overview
- Whitepaper
- Contributor guides

contributor/PULL_REQUEST_TEMPLATE.md

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+## Description
+
+<!-- A concise description of what your PR does and what issue it solves -->
+<!-- Use GitHub semantic linking: Fixes #123, Closes #456 -->
+
+## Type of Change
+
+- [ ] Bug fix (non-breaking change that fixes an issue)
+- [ ] New feature (non-breaking change that adds functionality)
+- [ ] Breaking change (fix or feature that would cause existing functionality to change)
+- [ ] Pallet change (changes to custom pallets in `/pezkuwi/pallets/`)
+- [ ] Runtime change (changes to runtime configuration)
+- [ ] XCM/Cross-chain change
+- [ ] Documentation update
+- [ ] CI/CD change
+
+## Changes Made
+
+<!-- List the specific changes made in this PR -->
+
+-
+
+## Testing
+
+<!-- Describe the tests you ran and how to reproduce them -->
+
+- [ ] Unit tests pass (`cargo test`)
+- [ ] Build succeeds (`cargo build --release`)
+- [ ] Benchmarks compile (`cargo build --release --features runtime-benchmarks`)
+- [ ] Manual testing completed (describe below)
+
+### Test Details
+
+<!-- How did you test this change? -->
+
+## Checklist
+
+- [ ] My code follows the project's style guidelines
+- [ ] I have performed a self-review of my code
+- [ ] I have commented my code, particularly in hard-to-understand areas
+- [ ] I have made corresponding changes to the documentation
+- [ ] My changes generate no new warnings
+- [ ] I have added tests that prove my fix is effective or that my feature works
+- [ ] New and existing unit tests pass locally with my changes
+- [ ] Any dependent changes have been merged and published
+
+## Security Considerations
+
+<!-- For changes to pallets, runtime, or financial logic -->
+
+- [ ] No new security vulnerabilities introduced
+- [ ] Financial calculations reviewed for overflow/underflow
+- [ ] Access control properly implemented
+- [ ] No sensitive data exposed
+
+## Breaking Changes
+
+<!-- If this is a breaking change, describe the impact and migration path -->
+
+N/A
+
+## Related Issues/PRs
+
+<!-- Link any related issues or PRs -->
+
+-
+
+---
+
+**For Reviewers:**
+- Check that tests cover the changes adequately
+- Verify no regressions in existing functionality
+- For pallet changes: review weight calculations
+- For XCM changes: verify cross-chain compatibility