docs(book): added the docs.video2x.org mdBook source files and pipeline

Signed-off-by: k4yt3x <i@k4yt3x.com>

docs/book/src/building/windows.md

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+# Windows
+
+Instructions for building this project on Windows.
+
+## 1. Prerequisites
+
+The following tools must be installed manually:
+
+- [Visual Studio 2022](https://visualstudio.microsoft.com/vs/)
+  - Workload: Desktop development with C++
+- [winget-cli](https://github.com/microsoft/winget-cli)
+
+## 2. Clone the Repository
+
+```bash
+# Install Git if not already installed
+winget install -e --id=Git.Git
+
+# Clone the repository
+git clone --recurse-submodules https://github.com/k4yt3x/video2x.git
+cd video2x
+```
+
+## 3. Install Dependencies
+
+```bash
+# Install CMake
+winget install -e --id=Kitware.CMake
+
+# Install Vulkan SDK
+winget install -e --id=KhronosGroup.VulkanSDK
+
+# Versions of manually installed dependencies
+$ffmpegVersion = "7.1"
+$ncnnVersion = "20240820"
+
+# Download and extract FFmpeg
+curl -Lo ffmpeg-shared.zip "https://github.com/GyanD/codexffmpeg/releases/download/$ffmpegVersion/ffmpeg-$ffmpegVersion-full_build-shared.zip"
+Expand-Archive -Path ffmpeg-shared.zip -DestinationPath third_party
+Rename-Item -Path "third_party/ffmpeg-$ffmpegVersion-full_build-shared" -NewName ffmpeg-shared
+
+# Download and extract ncnn
+curl -Lo ncnn-shared.zip "https://github.com/Tencent/ncnn/releases/download/$ncnnVersion/ncnn-$ncnnVersion-windows-vs2022-shared.zip"
+Expand-Archive -Path ncnn-shared.zip -DestinationPath third_party
+Rename-Item -Path "third_party/ncnn-$ncnnVersion-windows-vs2022-shared" -NewName ncnn-shared
+```
+
+## 4. Build the Project
+
+```bash
+cmake -S . -B build -DUSE_SYSTEM_NCNN=OFF -DUSE_SYSTEM_SPDLOG=OFF -DUSE_SYSTEM_BOOST=OFF `
+  -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=build/libvideo2x-shared
+cmake --build build --config Release --parallel --target install
+```
+
+The built binaries will be located in `build/libvideo2x-shared`.