添加文档【Wbi 接口签名】，修改目录结构

docs/misc/picture.md

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+# 图片格式化
+
+对于\*.hdslb.com/bfs下的图片文件都可以使用以下格式化参数
+
+> \*.hdslb.com/bfs/\*/\*.\[jpg/png/gif\]@{width}w\_{high}h\_{quality}q.{format}
+
+| 可选参数 | 含义             | 备注             |
+| -------- | ---------------- | ---------------- |
+| width    | 图片最大限制宽度 |                  |
+| high     | 图片最大限制高度 |                  |
+| quality  | 图片质量百分比   | 仅限webp         |
+| format   | 图片格式         | 仅限png/jpg/webp |
+
+**示例：**
+
+原始图片
+
+https://i1.hdslb.com/bfs/archive/e5fff1472bad1c0c6bcb3004205f9be23b58ffc0.jpg
+
+![](https://i1.hdslb.com/bfs/archive/e5fff1472bad1c0c6bcb3004205f9be23b58ffc0.jpg)
+
+高度限制为100
+
+https://i1.hdslb.com/bfs/archive/e5fff1472bad1c0c6bcb3004205f9be23b58ffc0.jpg@100h
+
+![](https://i1.hdslb.com/bfs/archive/e5fff1472bad1c0c6bcb3004205f9be23b58ffc0.jpg@100h)
+
+宽度限制为100
+
+https://i1.hdslb.com/bfs/archive/e5fff1472bad1c0c6bcb3004205f9be23b58ffc0.jpg@100w
+
+![](https://i1.hdslb.com/bfs/archive/e5fff1472bad1c0c6bcb3004205f9be23b58ffc0.jpg@100w)
+
+转换格式为webp
+
+https://i1.hdslb.com/bfs/archive/e5fff1472bad1c0c6bcb3004205f9be23b58ffc0.jpg@.webp
+
+![](https://i1.hdslb.com/bfs/archive/e5fff1472bad1c0c6bcb3004205f9be23b58ffc0.jpg@.webp)
+
+转换为webp图片质量为1%
+
+https://i1.hdslb.com/bfs/archive/e5fff1472bad1c0c6bcb3004205f9be23b58ffc0.jpg@1q.webp
+
+![](https://i1.hdslb.com/bfs/archive/e5fff1472bad1c0c6bcb3004205f9be23b58ffc0.jpg@1q.webp)