Add webp thumbnail conversion task to optimize performance of fast scrolling (#172)

* Update readme

* Added webp to table and entity

* Added cronjob and sharp dependencies

* Added conversion of webp every 5 minutes and endpoint will now server webp image if exist

server/src/api-v1/asset/entities/asset.entity.ts

@@ -26,6 +26,9 @@ export class AssetEntity {
   @Column({ nullable: true })
   resizePath: string;
 
+  @Column({ nullable: true })
+  webpPath: string;
+
   @Column()
   createdAt: string;