feat(mat-select): Allow to enter custom value

[csaikiran569]

Feature Description

Is there a way to enter custom value in the mat-select .

Use Case

I have a use case to allow user to enter a custom value and also select a value from dropdown .

I did spent a lot of time to find a solution for this .I apologize if this feature is available .Please do let me know if this feature is available or can be added if it is not available ?

For now as a work around I actually added an option as "Other" if user selects that option I was showing a input box to enter the value .

[crisbeto]

This sounds like mat-autocomplete: https://material.angular.io/components/autocomplete/overview

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