Introduces DEVELOPMENT.md

DEVELOPMENT.md

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+# Development Notes
+
+Spec Kit is a toolkit for spec-driven development. At its core, it is a coordinated set of prompts, templates, scripts, and CLI/integration assets that define and deliver a spec-driven workflow for AI coding agents. This document is a starting point for people modifying Spec Kit itself, with a compact orientation to the key project documents and repository organization.
+
+**Essential project documents:**
+
+| Document                                                   | Role                                                                                  |
+| ---------------------------------------------------------- | ------------------------------------------------------------------------------------- |
+| [README.md](README.md)                                     | Primary user-facing overview of Spec Kit and its workflow.                            |
+| [DEVELOPMENT.md](DEVELOPMENT.md)                           | This document.                                                                        |
+| [spec-driven.md](spec-driven.md)                           | End-to-end explanation of the Spec-Driven Development workflow supported by Spec Kit. |
+| [RELEASE-PROCESS.md](.github/workflows/RELEASE-PROCESS.md) | Release workflow, versioning rules, and changelog generation process.                 |
+| [docs/index.md](docs/index.md)                             | Entry point to the `docs/` documentation set.                                         |
+| [CONTRIBUTING.md](CONTRIBUTING.md)                         | Contribution process, review expectations, and required development practices.        |
+| [TESTING.md](TESTING.md)                                   | Validation strategy and testing procedures.                                           |
+
+**Main repository components:**
+
+| Directory          | Role                                                                                        |
+| ------------------ | ------------------------------------------------------------------------------------------- |
+| `templates/`       | Prompt assets and templates that define the core workflow behavior and generated artifacts. |
+| `scripts/`         | Supporting scripts used by the workflow, setup, and repository tooling.                     |
+| `src/specify_cli/` | Python source for the `specify` CLI, including agent-specific assets.                       |
+| `extensions/`      | Extension-related docs, catalogs, and supporting assets.                                    |
+| `presets/`         | Preset-related docs, catalogs, and supporting assets.                                       |