Windows Friendly Support

[WAY29]

1. add windows install powershell like install.ps1
2. build from source with windows met two errors:
   1. without "--local" options, goterror: sum sha256: exec: "shasum": executable file not found in %PATH%
   2. with "--local" options, got error: GOOS=windows GOARCH=amd64:rename C:\Users\admin\AppData\Local\Temp\xgo-release3949503335\xgo C:\Users\admin\.xgo\bin\xgo: The system cannot find the path specified.

Additionally, build from source binary with windows without ".exe" suffix

[xhd2015]

huh thanks WAY29 for your feedback. There is a temporary fix for the --local case, just mkdir C:\Users\admin\.xgo\bin before you run I don't have a windows PC on my hand so windows support is currently poor, I will solve this later.

[xhd2015]

Also you need to add C:\Users\admin\.xgo\bin to your system PATH variable to make xgo works. You can update PATH variable following this tutorial: https://www.architectryan.com/2018/03/17/add-to-the-path-on-windows-10/

[xhd2015]

Hi WAY29, I just updated master to solve the --local build-release mode, you can try it again, thanks!

[WAY29]

LGTM, how about use golang builtin library instead of shasum?

[xhd2015]

Good point, will do it. However notice that build-release without --local is actually for maintainer to build binaries into xgo-release/1.0.x, then upload them to github. If you just want to use it locally, --local is enough.