Added --save to "npm install @angular/material"

[ajayullal]

Added --save to "npm install @angular/material" to save the package to the dependencies list in package.json

[googlebot]

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[ajayullal]

I signed it!

[googlebot]

CLAs look good, thanks!

[devversion]

Can you add the --save to the the install instructions below as well? Here

[jelbourn]

LGTM

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