feat(igx-combo): add combo component files #1260

Author: Lipata

src/combo/README.md

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+# igx-combo
+
+`igx-combo` is a component.  
+A walkthrough of how to get started can be found [here](https://www.infragistics.com/products/ignite-ui-angular/angular/components/combo.html)
+
+# Usage
+
+
+Basic usage of `igx-combo`
+
+```html
+```
+
+## API
+
+# API Summary
+| Name   |      Type      |  Description |
+|:----------|:-------------:|:------|
+
+### Methods
+
+| open |
+|:----------|
+| Opens combo list items. |

src/combo/combo.component.html

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+<div class="igx-combo">
+    <ng-content></ng-content>
+</div>

src/combo/combo.component.spec.ts

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+import { ChangeDetectorRef, Component, ElementRef, EventEmitter, Input, NgModule, OnDestroy, OnInit, Output } from "@angular/core";
+import { IgxSelectionAPIService } from "../core/selection";
+import { IgxRippleModule } from "../directives/ripple/ripple.directive";
+
+@Component({
+    selector: "igx-combo",
+    templateUrl: "combo.component.html"
+})
+export class IgxComboComponent implements OnInit, OnDestroy {
+    @Input()
+    public data;
+
+    @Input()
+    public primaryKey;
+
+    @Output()
+    public onDropDownOpen = new EventEmitter<IComboDropDownOpenEventArgs>();
+
+    @Output()
+    public onDropDownClosed = new EventEmitter<IComboDropDownClosedEventArgs>();
+
+    @Output()
+    public onSelectionChange = new EventEmitter<IComboSelectionChangeEventArgs>();
+
+    constructor(
+        public selectionApi: IgxSelectionAPIService,
+        public cdr: ChangeDetectorRef,
+        private element: ElementRef) { }
+
+    public ngOnInit() {
+
+    }
+
+    public ngOnDestroy() {
+
+    }
+}
+
+export interface IComboDropDownOpenEventArgs {
+    event?: Event;
+}
+
+export interface IComboDropDownClosedEventArgs {
+    event?: Event;
+}
+
+export interface IComboSelectionChangeEventArgs {
+    oldSelection: any[];
+    newSelection: any[];
+    event?: Event;
+}
+
+@NgModule({
+    declarations: [IgxComboComponent],
+    exports: [IgxComboComponent],
+    imports: [IgxRippleModule]
+})
+export class IgxComboModule { }