Add mnemonic and QR for SSKR

**Describe the issue**
This is not a bug, but a request. 

In the Shamir Secret Sharing > SSKR, could you please produce not just the hex but also the mnemonic and QR code? 

**Which page(s) are the issues found on?**
https://bitcoiner.guide/seed/#/shamir

**Additional context**
The mnemonic is present for SLIP39 but not for SSKR

Thanks.