Thumbnail watermark

Add a watermark to thumbnails as per these states:
1. Image has tags
2. Image doesn't support tags (e.g. GIF)
3. Image in error state, preventing tags from working

```python
# embed image watermark

with Image.open("arya.jpg") as img:
# Get the width and height of the image
width, height = img.size

# Get the image watermark that already prepared
logo = Image.open("thumb.jpg")

# Resizing the watermark into desired size
size = (100, 100)
logo.thumbnail(size)

# Set the watermark position, if 0, it will set into top left of image
x = 0
y = 0

# Set the watermark position, if written as below, it will set into bottom right of image
x = width - 100
y = height - 100

# Integrate the image watermark into the watermark position
img.paste(logo, (x, y))

# Show the image
img.show()
```