Update README.md

Author: scott-xu

README.md

@@ -82,6 +82,9 @@ The main types provided by this library are:
 ## Key Exchange Methods
 
 **SSH.NET** supports the following key exchange methods:
+* mlkem768x25519-sha256
+* sntrup761x25519-sha512
+* sntrup761x25519-sha512<span></span>@openssh.com
 * curve25519-sha256
 * curve25519-sha256<span></span>@libssh.org
 * ecdh-sha2-nistp256