Add docfx files

Documentation/docfx.json

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+{
+  "metadata": [
+    {
+      "src": [
+        {
+          "src": "../Packages",
+          "files": [
+            "MinimalUtility/Runtime/**/*.cs",
+            "MinimalUtility/Editor/**/*.cs"
+          ]
+        }
+      ],
+      "dest": "api",
+      "disableGitFeatures": false,
+      "disableDefaultFilter": false,
+      "allowCompilationErrors": true,
+      "properties": {
+        "DefineConstants": "ENABLE_MINIMAL_DEBUGGING;ENABLE_UNITASK;ENABLE_R3;ENABLE_UGUI;ENABLE_UITOOLKIT;ENABLE_VCONTAINER;ENABLE_WEBREQUEST"
+      }
+    }
+  ],
+  "build": {
+    "content": [
+      {
+        "files": "**/*.{md,yml}",
+        "src": "api",
+        "dest": "api"
+      },
+      {
+        "files": [
+          "docs/**.md",
+          "docs/toc.yml",
+          "toc.yml",
+          "*.md"
+        ]
+      }
+    ],
+    "resource": [
+      {
+        "files": [
+          "images/**"
+        ]
+      }
+    ],
+    "output": "_site",
+    "template": [
+      "default",
+      "modern"
+    ],
+    "globalMetadata": {
+      "_appName": "MinimalUtility",
+      "_appTitle": "MinimalUtility",
+      "_appFooter": "<span>Copyright © 2024 kochounoyume. Generated with <a href=\"https://dotnet.github.io/docfx\">DocFX</a></span>",
+      "_enableSearch": true,
+      "pdf": true,
+      "_gitContribute": {
+        "repo": "https://github.com/kochounoyume/MinimalUtility"
+      },
+      "_gitUrlPattern": "github"
+    },
+    "xref": [
+      "https://normanderwan.github.io/UnityXrefMaps/xrefmap.yml",
+      "https://docs.unity3d.com/Packages/com.unity.ugui@1.0/xrefmap.yml"
+    ],
+    "xrefService": [
+      "https://xref.docs.microsoft.com/query?uid={uid}"
+    ],
+    "sitemap": {
+      "baseUrl": "https://kochounoyume.github.io/MinimalUtility/"
+    }
+  }
+}

Documentation/docs/getting-started.md

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+# Getting Started

Documentation/docs/introduction.md

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+# Introduction

Documentation/docs/toc.yml

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+- name: サンプル
+- name: Introduction
+  href: introduction.md
+- name: Getting Started
+  href: getting-started.md

Documentation/index.md

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+---
+_layout: landing
+---
+
+# This is the **HOMEPAGE**.
+
+Refer to [Markdown](http://daringfireball.net/projects/markdown/) for how to write markdown files.
+
+## Quick Start Notes:
+
+1. Add images to the *images* folder if the file is referencing an image.

Documentation/toc.yml

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+- name: Docs
+  href: docs/
+- name: API
+  href: api/