1.add screenshot folder & adding gif animation for README.md show

2.StorageTestDiskLruCache.ets & TestAllTypeImageKnifeComponentPage Code optimization

Signed-off-by: zhoulisheng <635547767@qq.com>

entry/src/main/ets/MainAbility/pages/storageTestDiskLruCache.ets

@@ -146,9 +146,6 @@ struct StorageTestDiskLruCache {
         this.imageKnifeChangeSource(data)
       })
     }
-    if (this.imageKnifeOption.transformations) {
-      request.transforms(this.imageKnifeOption.transformations)
-    }
 
     if (this.imageKnifeOption.size) {
       request.setImageViewSize(this.imageKnifeOption.size)

entry/src/main/ets/MainAbility/pages/testAllTypeImageKnifeComponentPage.ets

@@ -15,6 +15,7 @@
 import {ImageKnifeComponent} from '@ohos/imageknife'
 import {ImageKnifeOption} from '@ohos/imageknife'
 import {RotateImageTransformation} from '@ohos/imageknife'
+import {TransformType} from '@ohos/imageknife'
 
 @Entry
 @Component