update readme

Author: weizhengwei

README.md

@@ -1,2 +1,13 @@
 # WinCalcFileHash
 a tiny windows applicaton, calc file hash md5 sha1 sha256
+
+### Features:
+- menu open a or more file
+- drag file to window
+- copy calc info to clipboard
+
+### W.I.P
+- opt calc
+
+### Snap 
+![Alt text](./WinCalcFileHash.png "WinCalcFileHash扫雷")