Support Windows

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[oferb]

Support Windows

[oferb]

Related issue for bazel tools - bazelbuild/buildtools#375
Related issue for grpc_java_plugin: grpc/grpc-java#4859
Android SDK for Windows: https://dl.google.com/android/repository/sdk-tools-windows-4333796.zip
clang-format for Windows can be downloaded.
grpcwebproxy can be cross-compiled for Windows (and Mac) on Linux.

[val-fed]

Windows Subsystem for Linux (WSL)

The Windows Subsystem for Linux lets developers run GNU/Linux environment -- including most command-line tools, utilities, and applications -- directly on Windows, unmodified, without the overhead of a virtual machine.

How to install?

Please follow the guide - https://docs.microsoft.com/en-us/windows/wsl/about
Note: You may have to upgrade the version of Windows. If you need it you will know about it at the very beginning of the installation.

How to use StartupOS in WSL?

Just to follow instructions - https://github.com/google/startup-os#how-to-use-startupos

Productivity testing in the same machine:

Execution time ./build.sh

Ubuntu:
INFO: Elapsed time: 115.979s, Critical Path: 46.37s
INFO: 520 processes: 384 linux-sandbox, 56 local, 80 worker.
INFO: Build completed successfully, 806 total actions

Ubuntu on Windows:
INFO: Elapsed time: 471.787s, Critical Path: 102.78s
INFO: 605 processes: 494 processwrapper-sandbox, 111 worker.
INFO: Build completed successfully, 782 total actions

Execution time ./test.sh

Ubuntu:
INFO: Elapsed time: 24.577s, Critical Path: 24.08s
INFO: 15 processes: 13 linux-sandbox, 2 local.
INFO: Build completed successfully, 16 total actions

Ubuntu on Windows:
INFO: Elapsed time: 147.112s, Critical Path: 145.24s
INFO: 15 processes: 2 local, 13 processwrapper-sandbox.
INFO: Build completed successfully, 16 total actions

[oferb]

Looks great!
Please add documentation on Platforms:
https://github.com/google/startup-os#platforms