docs #24: Add HELLO.md for new contributors

HELLO.md

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+# Hello, Contributor! 👋
+
+Welcome to **Kugetsu** — an agent orchestration system for parallel task execution.
+
+## Quick Start
+
+1. **Clone the repo**
+   ```bash
+   git clone https://git.fbrns.co/shoko/kugetsu.git
+   cd kugetsu
+   ```
+
+2. **Read the docs**
+   - [README](./README.md) — Project overview
+   - [Architecture](./docs/kugetsu-architecture.md) — System design
+   - [Hermes Setup](./docs/hermes-setup.md) — Agent framework setup
+
+3. **Pick an issue**
+   - Browse [open issues](https://git.fbrns.co/shoko/kugetsu/issues)
+   - Look for issues labeled `good first issue` or `help wanted`
+
+4. **Contribute**
+   - Create a branch: `git checkout -b docs/issue-{N}-title main`
+   - Make your changes
+   - Open a PR against `main`
+
+## Workflow
+
+```
+You (Executive)
+    └── PM Agent (coordinates)
+            ├── Coding Agent A → Issue 1 → PR
+            ├── Coding Agent B → Issue 2 → PR
+            └── ...
+```
+
+For details, see [Subagent Workflow](./docs/SUBAGENT_WORKFLOW.md).
+
+## Questions?
+
+Open an issue or check the [documentation](./docs/).
+
+Happy contributing!