[Document] "Installation Guidelines" need add install step about "bower"

[LazyKnightX]

After I cloned blur-admin, following the installation guidelines, but the serve command does not work and throw error that I didn't install jquery library which needs bower to install.

Please fix the document.

Requirement: bower (npm install -g bower) After install npm: bower install --force

[LazyKnightX]

Okay, after that, the gulp serve:dist still throw error:

'fonts' errored after 21 ms Error: Bower components directory does not exist at D:\wow8-bbs.wow8.org\admincp\bower_components (node:12688) UnhandledPromiseRejectionWarning: Error: Error: jquery is not installed. Try running bower install or remove the component from your bower.js on file.

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