update readme.md

Author: ANKUR DWIVEDI

README.md

@@ -200,20 +200,81 @@ params := ikurl.UrlParam{
 }
 ```
 
-**3. Adding overlays to images**
+**3. Adding overlays**
+
+ImageKit.io enables you to apply overlays to [images](https://docs.imagekit.io/features/image-transformations/overlay-using-layers) and [videos](https://docs.imagekit.io/features/video-transformation/overlay) using the raw parameter with the concept of [layers](https://docs.imagekit.io/features/image-transformations/overlay-using-layers#layers). The raw parameter facilitates incorporating transformations directly in the URL. A layer is a distinct type of transformation that allows you to define an asset to serve as an overlay, along with its positioning and additional transformations.
+
+**Text as overlays**
+
+You can add any text string over a base video or image using a text layer (l-text).
+
+For example:
+
+```go
+params := ikurl.UrlParam{
+    Path:        "default-image.jpg",
+    UrlEndpoint: "https://ik.imagekit.io/demo-id/",
+    Transformations: []map[string]any{
+        {
+            "height": 300,
+            "width":  400,
+            "raw": "l-text,i-Imagekit,fs-50,l-end"
+        },
+    },
+}
+```
+**Sample Result URL**
+```
+https://ik.imagekit.io/demo-id/default-image.jpg?tr=h-300,w-400,l-text,i-Imagekit,fs-50,l-end
+```
+
+**Image as overlays**
+
+You can add an image over a base video or image using an image layer (l-image).
+
+For example:
 
-ImageKit.io  allows overlaying [text](https://docs.imagekit.io/features/image-transformations/overlay-using-layers#add-text-over-image) or [image](https://docs.imagekit.io/features/image-transformations/overlay-using-layers#add-images-over-image) over other images and videos for watermarking or creating dynamic assets using custom text.
 ```go
 params := ikurl.UrlParam{
     Path:        "default-image.jpg",
     UrlEndpoint: "https://ik.imagekit.io/demo-id/",
     Transformations: []map[string]any{
         {
+            "height": 300,
+            "width":  400,
             "raw": "l-image,i-default-image.jpg,w-100,b-10_CDDC39,l-end"
         },
     },
 }
 ```
+**Sample Result URL**
+```
+https://ik.imagekit.io/demo-id/default-image.jpg?tr=h-300,w-400,l-image,i-default-image.jpg,w-100,b-10_CDDC39,l-end
+```
+
+**Solid color blocks as overlays**
+
+You can add solid color blocks over a base video or image using an image layer (l-image).
+
+For example:
+
+```go
+params := ikurl.UrlParam{
+    Path:        "img/sample-video.mp4",
+    UrlEndpoint: "https://ik.imagekit.io/demo-id/",
+    Transformations: []map[string]any{
+        {
+            "height": 300,
+            "width":  400,
+            "raw": "l-image,i-ik_canvas,bg-FF0000,w-300,h-100,l-end"
+        },
+    },
+}
+```
+**Sample Result URL**
+```
+https://ik.imagekit.io/demo-id/img/sample-video.mp4?tr=h-300,w-400,l-image,i-ik_canvas,bg-FF0000,w-300,h-100,l-end
+```
 #### List of supported transformations
 
 See the complete list of transformations supported in ImageKit [here](https://docs.imagekit.io/features/image-transformations). The SDK gives a name to each transformation parameter e.g. `height` for `h` and `width` for `w` parameter. It makes your code more readable. If the property does not match any of the following supported options, it is added as it is.