chore: add files for os

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug Report
+about: Report a bug
+---
+
+## Description
+
+What happened?
+
+## Expected Behavior
+
+What should happen?
+
+## Steps to Reproduce
+
+1.
+2.
+3.
+
+## Environment
+
+- sheen version:
+- Rust version:
+- OS:

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature Request
+about: Suggest an idea
+---
+
+## Description
+
+What would you like?
+
+## Use Case
+
+Why do you need this?
+
+## Possible Implementation
+
+Any ideas on how to implement it?

.github/pull_request_template.md

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+## Description
+
+Brief description of changes.
+
+## Type of Change
+
+- [ ] Bug fix
+- [ ] New feature
+- [ ] Documentation
+- [ ] Refactor
+
+## Checklist
+
+- [ ] `cargo fmt` ran
+- [ ] `cargo clippy` passes
+- [ ] `cargo test` passes
+- [ ] Updated README if needed

.github/workflows/ci.yml

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+name: CI
+
+on:
+  push:
+    branches: [main, develop]
+  pull_request:
+    branches: [main, develop]
+
+env:
+  CARGO_TERM_COLOR: always
+
+jobs:
+  check:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: dtolnay/rust-toolchain@stable
+      - run: cargo fmt --check
+      - run: cargo clippy -- -D warnings
+      - run: cargo test
+      - run: cargo build --release