docs: Add DocFX project to generate the API documentation (#4)

docs/.gitignore

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+###############
+#    folder   #
+###############
+/**/DROP/
+/**/TEMP/
+/**/packages/
+/**/bin/
+/**/obj/
+/**/plugins
+_site

docs/api/.gitignore

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+###############
+#  temp file  #
+###############
+*.yml
+.manifest

docs/docfx.json

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+{
+  "metadata": [
+    {
+      "src": [
+        {
+          "src": "..",
+          "files": [
+            "src/Core/**.csproj"
+          ]
+        },
+        {
+          "src": "..",
+          "files": [
+            "src/Attributes/**.csproj"
+          ]
+        }
+      ],
+      "dest": "api",
+      "disableGitFeatures": false,
+      "disableDefaultFilter": false
+    }
+  ],
+  "build": {
+    "content": [
+      {
+        "files": [
+          "api/**.yml"
+        ]
+      },
+      {
+        "files": [
+          "toc.yml",
+          "index.md"
+        ]
+      }
+    ],
+    "resource": [
+      {
+        "files": [
+          "images/**"
+        ]
+      }
+    ],
+    "overwrite": [
+      {
+        "files": [
+          "apidoc/**.md"
+        ],
+        "exclude": [
+          "obj/**",
+          "_site/**"
+        ]
+      }
+    ],
+    "globalMetadata": {
+      "_appTitle": "CPlugin.Net",
+      "_enableNewTab": true,
+      "_appFooter": "Copyright ©2023 <b>CPlugin.Net</b>",
+      "_enableSearch": true,
+      "_gitContribute": {
+        "repo": "https://github.com/MrDave1999/CPlugin.Net",
+        "branch": "master"
+      }
+    },
+    "dest": "_site",
+    "globalMetadataFiles": [],
+    "fileMetadataFiles": [],
+    "template": [
+      "default",
+      "plugins/memberpage/content"
+    ],
+    "postProcessors": ["ExtractSearchIndex"],
+    "markdownEngineName": "markdig",
+    "noLangKeyword": false,
+    "keepFileLink": false,
+    "cleanupCacheHistory": false,
+    "disableGitFeatures": false,
+    "xrefService": [ "https://xref.docs.microsoft.com/query?uid={uid}" ]
+  }
+}

docs/index.md

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+# CPlugin.Net
+
+[![CPlugin.Net](https://img.shields.io/nuget/vpre/CPlugin.Net?label=CPlugin.Net%20-%20nuget&color=red)](https://www.nuget.org/packages/CPlugin.Net)
+[![downloads](https://img.shields.io/nuget/dt/CPlugin.Net?color=yellow)](https://www.nuget.org/packages/CPlugin.Net)
+
+[![CPlugin.Net.Attributes](https://img.shields.io/nuget/vpre/CPlugin.Net.Attributes?label=CPlugin.Net.Attributes%20-%20nuget&color=red)](https://www.nuget.org/packages/CPlugin.Net.Attributes)
+[![downloads](https://img.shields.io/nuget/dt/CPlugin.Net.Attributes?color=yellow)](https://www.nuget.org/packages/CPlugin.Net.Attributes)
+
+[![CPlugin.Net-logo](https://raw.githubusercontent.com/MrDave1999/CPlugin.Net/bd7e7c8787e5a1b4987cd5a506e680261dce19b0/plugin-logo.png)](https://github.com/MrDave1999/CPlugin.Net)
+
+A simple library that implements a plugin loader for .NET. It also includes a `PluginAttribute` type to be used by plugins.

docs/toc.yml

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+- name: API Documentation
+  href: api/
+- name: GitHub
+  href: https://github.com/MrDave1999/CPlugin.Net