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README.md

@@ -1,2 +1,21 @@
 # imago
-Image saving & comparing tool for go.
+Image saving & comparing tool for go based on webp.
+
+## Functions
+### func Str2bytes(s string) []byte
+Fast convert
+### func Bytes2str(b []byte) string
+Fast convert
+### func GetDHashStr(img image.Image) (string, error)
+Get image dhash encoded by [go-base16384](https://github.com/fumiama/go-base16384)
+### func HammDistance(img1 string, img2 string) (int, error)
+Get hamming distance between two dhash strings
+### func Scanimgs(imgdir string) error
+Scan all images like 编码后哈希.webp
+### func Pick(exclude []string) string
+Pick a random image
+### func Saveimgbytes(b []byte, imgdir string, uid string, force bool) string
+### func Saveimg(r io.Reader, imgdir string, uid string) string
+Save image into imgdir with name like 编码后哈希.webp
+### func Addimage(name string)
+manually add an image name into map