Instruction to use HSM with DCL UI and Keppler

[ashcherbakov]

• Check that Ledger Nano works with DCL UI (Keppler)
• Check that Ledger Nano works with DCL CLI
• Prepare instructions

[akarabashov]

PR: https://github.com/zigbee-alliance/distributed-compliance-ledger/pull/569

• Checked that Ledger Nano works with DCL
• Prepared instruction: https://github.com/zigbee-alliance/distributed-compliance-ledger/blob/master/docs/ledger-nano.md