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/migration/1653214255670-UpdateAssetTableWithWebpPath.ts

@@ -0,0 +1,19 @@
+import { MigrationInterface, QueryRunner } from "typeorm";
+
+export class UpdateAssetTableWithWebpPath1653214255670 implements MigrationInterface {
+
+  public async up(queryRunner: QueryRunner): Promise<void> {
+    await queryRunner.query(`
+      alter table assets
+        add column if not exists "webpPath" varchar default '';
+      `)
+  }
+
+  public async down(queryRunner: QueryRunner): Promise<void> {
+    await queryRunner.query(`
+      alter table assets
+        drop column if exists "webpPath";     
+      `);
+  }
+
+}