Update README.md

Added note to clarify signed data must be hashed before signature or verification process in response to issue indutny#293 .
Red-Bowler · Nov 24, 2022 · 20395cf · 20395cf
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@@ -43,6 +43,13 @@ Fastest is elliptic#ecdh
 
 ## API
 
+> Note: This library does NOT hash the signed data, you must hash it manually.
+```javascript
+// Example of SHA256 hash with hash.js (use your prefered hash library)
+var hash = require('hash.js');
+var msgHash = hash.sha256().update(data_to_be_signed_or_verified).digest('hex');
+```
+
 ### ECDSA
 
 ```javascript