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docs: add windows build instructions

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Python wrapper for SentencePiece. This API will offer the encoding, decoding and training of Sentencepiece.
## Build and Install SentencePiece
For Linux (x64/i686), macOS, and Windows(win32/x64) environment, you can simply use pip command to install SentencePiece python module.
For Linux (x64/i686), macOS, and Windows(win32/x64/arm64) environment, you can simply use pip command to install SentencePiece python module.
```
% pip install sentencepiece
@ -27,6 +27,20 @@ If you don’t have write permission to the global site-packages directory or do
% python setup.py install --user
```
For Windows users who want to build from source, you can build and install the Python wrapper using Visual Studio. First, you need to install the `pwsh.exe` (Powershell 7). Use `winget install --id Microsoft.Powershell --source winget` to install directly. Then open the `Developer PowerShell for VS 2022`, and execute the following commands.
```
git clone https://github.com/google/sentencepiece.git
cd sentencepiece
mkdir build
cd build
cmake .. -DSPM_ENABLE_SHARED=OFF -DCMAKE_INSTALL_PREFIX=".\root"
cmake --build . --config Release --target install
cd ../python
pip install wheel
python setup.py bdist_wheel
Get-ChildItem .\dist\sentencepiece*.whl | ForEach-Object { pip install $_.FullName }
```
## Usage
See [this google colab page](https://github.com/google/sentencepiece/blob/master/python/sentencepiece_python_module_example.ipynb) to run sentencepiece interactively.