generate batch script entryfile for windows

[johnnychen94]

This doesn't fix every issue I've met when using Comonicon on Windows, but I believe it's a good first step.

[codecov[bot]]

Codecov Report

Patch coverage: 19.04% and project coverage change: -1.30 :warning:

Comparison is base (63c46c0) 82.84% compared to head (9e7b362) 81.55%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #241 +/- ## ========================================== - Coverage 82.84% 81.55% -1.30% ========================================== Files 21 24 +3 Lines 1586 1610 +24 ========================================== - Hits 1314 1313 -1 - Misses 272 297 +25 ``` | [Impacted Files](https://app.codecov.io/gh/comonicon/Comonicon.jl/pull/241?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None) | Coverage Δ | | |---|---|---| | [src/builder/install.jl](https://app.codecov.io/gh/comonicon/Comonicon.jl/pull/241?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None#diff-c3JjL2J1aWxkZXIvaW5zdGFsbC5qbA==) | `61.45% <19.04%> (-13.21%)` | :arrow_down: | ... and [7 files with indirect coverage changes](https://app.codecov.io/gh/comonicon/Comonicon.jl/pull/241/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None)

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[Roger-luo]

I'm good to merge this PR since it's not breaking any CIs, I'm wondering what you think would be the next step? e.g how should people add this to their path on windows?

[johnnychen94]

I'm wondering what you think would be the next step? e.g how should people add this to their path on windows?

In Powershell we can use

[System.Environment]::SetEnvironmentVariable('PATH', $env:USERPROFILE + '\.julia\bin;'+$Env:Path, [System.EnvironmentVariableTarget]::User)

should I add this to the documentation?

To modify the PATH manually, one can follow this instruction.

[johnnychen94]

bump @Roger-luo