edit README

README.md

@@ -1,2 +1,54 @@
 # unibase2n
 generate base2^n starting from any position in unicode table
+
+## Interface
+```go
+// NewBase generates a new base2n config
+func NewBase(off, til uint16, bit uint8) (bs Base, err error)
+```
+- `off` is the starting offset in unicode table
+- `til` is the starting offset of the tail character, which could not cross with off area
+- `bit` is the number `n` of `2^n`, for example bit `6` means `2^6=64`, thus `base64`
+
+## Supported Base2n
+> see more in define.go
+
+### Base16384
+> see https://github.com/fumiama/base16384
+```
+1234567 -> 婌焳廔萷
+```
+### Base8192
+```
+12345678 -> 눦듌옚뽣며찈
+```
+
+### Base256
+```
+12345678 -> ᄱᄲᄳᄴᄵᄶᄷᄸ
+```
+
+### Base128
+```
+1234567 -> ⑸⒬⒦⒓⒁⒴Ⓦ⒗
+```
+
+### Base64Gua
+```
+123456 -> ䷌䷓䷈䷳䷍䷃䷔䷶
+```
+
+### Base32
+```
+12345 -> ▆▄▙▃▆▍▁▕
+```
+
+### Base16
+```
+1234 -> ㆓㆑㆓㆒㆓㆓㆓㆔
+```
+
+### Base8Gua
+```
+123456 -> ☱☴☲☳☱☰☶☳☱☵☰☳☲☴☶☶
+```