waifu2x-ncnn-vulkan: add page (#9478)

pages/common/waifu2x-ncnn-vulkan.md

@@ -0,0 +1,16 @@
+# waifu2x-ncnn-vulkan
+
+> Image upscaler for manga/anime-style images using NCNN neural network framework.
+> More information: <https://github.com/nihui/waifu2x-ncnn-vulkan>.
+
+- Upscale an image:
+
+`waifu2x-ncnn-vulkan -i {{path/to/input_file}} -o {{path/to/output_file}}`
+
+- Upscale an image by a custom scale factor and denoise it:
+
+`waifu2x-ncnn-vulkan -i {{path/to/input_file}} -o {{path/to/output_file}} -s {{1|2|4|8|16|32}} -n {{-1|0|1|2|3}}`
+
+- Save the upscaled image in a specific format:
+
+`waifu2x-ncnn-vulkan -i {{path/to/input_file}} -o {{path/to/output_file}} -f {{jpg|png|webp}}`