feat(examples): add image_scale (#7)

Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

examples/image_scale/README.md

@@ -0,0 +1,60 @@
+# Image Scaling — GPU Bilinear Resize with Sampler
+
+Downscale an image on the GPU using Level Zero's native **image** and **sampler** objects. The sampler performs hardware-accelerated bilinear interpolation, producing a high-quality resized image in a single kernel dispatch.
+
+## What It Does
+
+1. Decodes an embedded WebP image (1272 × 855) and converts it to RGBA
+2. Computes the target dimensions (capped at 512 px on the longest side)
+3. Discovers a GPU device and prints its basic & compute properties
+4. Creates a SPIR-V module from an OpenCL C kernel compiled offline
+5. Uses `zeKernelSuggestGroupSize` to pick an optimal 2-D workgroup size
+6. Allocates host/device memory and two Level Zero **image objects** (input & output)
+7. Creates a **sampler** with clamp addressing and bilinear filtering
+8. Executes three command lists via a command queue:
+   - **Pre**: copy host pixels → device buffer → input image
+   - **Compute**: launch the `scale` kernel
+   - **Post**: copy output image → device buffer → host memory
+9. Writes the result to `small.png`
+
+## Run
+
+```bash
+go run main.go
+```
+
+## Result
+
+| Before Scaling (1272 × 855) | After Scaling (512 × 344) |
+|:----------------------------:|:-------------------------:|
+| ![input](暖笺贺春.webp) | ![output](small.png) |
+
+### Console Output
+
+```
+===============   Image Information   ===============
+Image Format:                webp
+Image W/H ratio:             1.4877
+Image Size:                  1272 x 855
+Scale to Image Size:         512 x 344
+Scale ratio:                 0.4025
+Image Data Size:             144802 bytes
+===============  Device Basic Properties  ===============
+Running on device: ID = 32103 , Name = Intel(R) Graphics @ 0.00 GHz.
+=============== Device Compute Properties ===============
+Max Group Size (X, Y, Z):    (1024, 1024, 1024)
+Max Group Count (X, Y, Z):   (4294967295, 4294967295, 4294967295)
+Max Total Group Size:        1024
+Max Shared Local Memory:     65536
+Subgroup Sizes:              [8 16 32]
+=============== Computation Configuration ===============
+Group Size (X, Y, Z):        (64, 4, 1)
+Group Count (X, Y, Z):       (8, 86, 1)
+Total Elements (srcN, dstN): (4350240, 704512)
+Source Buffer Size:          4248.28 KiB
+Dest Buffer Size:            688.00 KiB
+===============    Calculation Results    ===============
+GPU Execution Time:          1.579000 ms
+GPU Throughput:              2.76 GiB/s
+Test Passed!!!
+```