Add MIT license and quick start docs

LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2026 nejimakibird
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

@@ -105,6 +105,15 @@ Manual installation outline:
 3. Copy the plugin files into `.obsidian/plugins/model-weave/` in your vault.
 4. Enable Model Weave in Obsidian Desktop.
 
+## Quick Start
+
+1. Install and enable Model Weave in Obsidian Desktop.
+2. Open a file from [samples/](samples/) or create a Markdown model file in your vault.
+3. Add frontmatter such as `type: class`, `type: er_entity`, or `type: dfd_diagram`.
+4. Open the Model Weave Viewer and confirm the parsed preview.
+5. Use Custom mode for detailed review where available.
+6. Use Mermaid mode for overview, relationship, and flow views where available.
+
 ## Viewer behavior
 
 - Shared Viewer features include zoom, fit, `100%`, pan, diagnostics, upper/lower resizable panels, and PNG export.
@@ -188,3 +197,7 @@ Useful manual checks:
 - This repository contains samples and test-oriented files side by side.
 - `testdata/` is for warning/unsupported/diagnostic checks and is not the main public sample set.
 - Some format docs are still pending publication as standalone spec pages. The current docs index marks those cases explicitly instead of inventing partial specs here.
+
+## License
+
+Model Weave is released under the [MIT License](LICENSE).

README_JP.md

@@ -96,6 +96,14 @@ toolbar での選択は一時的な表示 override で、Markdown や frontmatte
 3. vault の `.obsidian/plugins/model-weave/` に配置する
 4. Obsidian Desktop で plugin を有効化する
 
+## クイックスタート
+
+1. Obsidian Desktop に Model Weave をインストールして有効化します。
+2. [samples/](samples/) を参照またはコピーするか、新しい Markdown モデルファイルを作成します。
+3. frontmatter に `type: class`、`type: er_entity`、`type: dfd_diagram` などを指定します。
+4. Model Weave Viewer で開いてプレビューを確認します。
+5. 詳細確認は Custom、全体俯瞰や関係把握は Mermaid を使います。
+
 ## Viewer の考え方
 
 - shared Viewer features として zoom / fit / `100%` / pan / diagnostics / upper-lower resizable layout / PNG export を持ちます
@@ -162,3 +170,7 @@ V0.7 の `dfd_diagram.Objects` 推奨列:
 - `testdata/` は diagnostics / compatibility 確認用です
 - mobile 向け最適化は現時点では前提にしていません
 - public release に向けて docs と samples を段階的に整理中です
+
+## ライセンス
+
+Model Weave は [MIT License](LICENSE) で公開します。詳細は `LICENSE` を参照してください。