Yarn Installer should prepend global bin directory to path

[sandorfr]

Before opening an issue please read this.

Are you reporting a bug or a feature request ?

• Bug
• Feature request

Description

%LOCALAPPDATA%\Yarn\bin should be prependend to path in order to enable yarn global add to work properly

System information

VSTS or TFS:

• VSTS
• TFS

Agent:

• Hosted
• Custom

OS:

• Windows
• Mac
• Linux

Yarn version:
N/A

Node version:
N/A

[sandorfr]

Actually hosted agent are not using the default prefix but C:\npm\prefix\bin
https://yarnpkg.com/lang/en/docs/cli/global/