Add windows build instructions for the ggml plugin

[hydai]

Explanation

In this PR, I added a section to show how to setup the dependencies we need for building the ggml plugin on the Windows platform, including how to execute an example.

Related issue

None.

What type of PR is this

/kind documentation

Proposed Changes

A new section for the building and execution process.

[juntao]

Hello, I am a PR summary agent on flows.network. Here are my reviews of code commits in this PR.

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Commit d3b9d8c8a9ab67bf38f66190f3e7ab97380eb4b6

• The patch adds instructions for building the ggml plugin on Windows systems.
• This is significant as it expands the compatibility of the software to a broader range of operating systems, increasing its usability.
• Key steps include installing dependencies such as CUDA Toolkit (optional), Visual Studio 2022 Community Edition, cmake, git, and ninja-build.
• The build process involves using the Developer PowerShell for VS 2022 to clone the WasmEdge repository, compile it with specific configurations, and then execute the WASI-NN plugin with a llama example.
• The patch also provides instructions on how to enable or disable CUDA during the build process.
• Finally, it includes a section on setting environment variables and executing the plugin using the llama example.

[juntao]

LGTM