add ng class angular 6 code example

Example 1: angular ngclass

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      <some-element [ngClass]="'first second'">...</some-element>

<some-element [ngClass]="['first', 'second']">...</some-element>

<some-element [ngClass]="{'first': true, 'second': true, 'third': false}">...</some-element>

<some-element [ngClass]="stringExp|arrayExp|objExp">...</some-element>

<some-element [ngClass]="{'class1 class2 class3' : true}">...</some-element>

Example 2: Angular 8 ngClass If

[class.my-class]="step=='step1'"

Example 3: ng class project

ngDoCheck()