Update README.md

Author: zyjblockchain

README.md

@@ -152,6 +152,8 @@ Package for Arweave develop toolkit.
 - [x] AssembleSigShares
 - [x] VerifySigShare
 
+[Threshold Signature Usage Guidelines](https://github.com/everFinance/goar/wiki/GOAR--RSA-Threshold-Signature-Usage-Guidelines)    
+
 Create RSA Threshold Cryptography:
 
 ```golang
@@ -283,4 +285,4 @@ You can also resume an upload from just the transaction ID and data, once it has
 ```
 
 ##### NOTE: About all chunk transfer full example can be viewed in path `./example/chunks_tx_test.go`
----
+---