Link: add link component (#15052)

types/link.d.ts

@@ -0,0 +1,25 @@
+import { ElementUIComponent } from './component'
+
+/** Button type */
+export type LinkType = 'primary' | 'success' | 'warning' | 'danger' | 'info' 
+
+/** Link Component */
+export declare class ElLink extends ElementUIComponent {
+  /** Link type */
+  type: LinkType
+  
+  /** Disable the link */
+  disabled: boolean
+
+  /** Link underline */
+  underline: boolean
+
+  /** Link icon, accepts an icon name of Element icon component */
+  icon: string
+
+  /** Link href */
+  href: string
+
+  /** Link target */
+  target: string
+}