Create CONTRIBUTING.md

Author: root28root

CONTRIBUTING.md

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+# Contributing
+
+Thanks for considering a contribution! This is a Move monorepo (Aptos-first, Sui-friendly).
+
+## Dev Setup
+- OS: Linux/macOS or Windows + WSL
+- Aptos CLI >= 7.8.0
+- `./tools/check.sh` runs build + unit tests for all subprojects.
+
+## Conventions
+- Use `0x1::...` imports for stdlib (not `std::` in our code/tests).
+- Keep test modules `#[test_only]`.
+- Each feature/change must include unit tests (positive + at least one negative).
+- Commit messages: short, imperative (e.g. `escrow: add refund test; tighten E_NOT_FUNDED`).
+
+## PR Checklist
+- [ ] `./tools/check.sh` is green
+- [ ] New/changed logic has tests
+- [ ] README updated if public API changed
+- [ ] No `{{ADDR}}` placeholders
+
+## Project Map
+- `mytoken/` — demo token API
+- `escrow/` — deal funding/release
+- `simplenft/` — minimal NFT registry
+- `minimarket/` — list/buy with fee pool
+- `paysplit/` — proportional revenue splitter
+
+## Issue Templates
+Use **“💼 Hire me”** for paid tasks. For bugs/features, please describe:
+- What happened vs expected
+- Module/function
+- Minimal repro (unit test or steps)