Update README.md

Add hardware wallet instructions

README.md

@@ -10,18 +10,36 @@ smcli allows you to read encrypted wallet files (including those created using S
 
 ### Reading
 
-To read an encrypted wallet file, run `smcli wallet read <filename>`. You'll be prompted to enter the (optional) password used to encrypt the wallet file. If you enter the correct password, you'll see the contents of the wallet printed, including the accounts it contains. Include the flags `--full` to see full keys, and `--private` to see private keys and mnemonic in addition to public keys.
+To read an encrypted wallet file, run:
+
+```
+smcli wallet read <filename>
+```
+
+You'll be prompted to enter the (optional) password used to encrypt the wallet file. If you enter the correct password, you'll see the contents of the wallet printed, including the accounts it contains. Include the flags `--full` to see full keys, and `--private` to see private keys and mnemonic in addition to public keys.
 
 Note that you can read both wallet files created using `smcli` as well as those created using [Smapp](https://github.com/spacemeshos/smapp/) or any other tool that supports standard Spacemesh wallet format.
 
 ### Generation
 
-To generate a new wallet, run `smcli wallet create`. The command will prompt you to enter a [BIP39-compatible mnemonic](https://github.com/bitcoin/bips/blob/master/bip-0039.mediawiki), or alternatively generate a new, random mnemonic for you. It will then prompt you to enter a password to encrypt the wallet file (optional but highly recommended) and will then generate an encrypted wallet file with one or more new keypairs.
+To generate a new wallet, run:
+
+```
+smcli wallet create
+```
+
+The command will prompt you to enter a [BIP39-compatible mnemonic](https://github.com/bitcoin/bips/blob/master/bip-0039.mediawiki), or alternatively generate a new, random mnemonic for you. It will then prompt you to enter a password to encrypt the wallet file (optional but highly recommended) and will then generate an encrypted wallet file with one or more new keypairs.
 
 Note that these keypairs (public and private key) are _not_ the same as Spacemesh wallet addresses. The public key can be converted directly and deterministically into your wallet address; in other words, there is a one-to-one mapping between public keys and wallet addresses. Conversion and outputting of public keys as wallet addresses [will be available shortly](https://github.com/spacemeshos/smcli/issues/38).
 
 #### Hardware wallet support
 
-Support for hardware wallets such as Ledger devices is not currently available in `smcli` but will be [added shortly](https://github.com/spacemeshos/smcli/issues/10).
+`smcli` supports key generation using Ledger hardware devices including Nano S, Nano S+, and Nano X. To generate a wallet file using a hardware wallet, first sideload the [Spacemesh Ledger app](https://github.com/spacemeshos/app-spacemesh) onto your device (follow the instructions in that README). Make sure the device is connected and unlocked and the Spacemesh app is open, then run:
+
+```
+smcli wallet create --ledger
+```
+
+Note that the created wallet file will not contain any private keys or mnemonic (as these obviously remain on the Ledger device). If you subsequently use `smcli wallet read` to read the file, these will not be printed. We still recommend encrypting the wallet file with a secure password for privacy purposes.
 
-**NOTE: We strongly recommend only creating a new wallet on a secure, airgapped computer. You are responsible for safely storing your mnemonic and wallet files. Your mnemonic is the ONLY way to restore access to your wallet and accounts if you misplace the wallet file, so it's essential that you back it up securely and reliably. There is absolutely nothing that we can do to help you recover your wallet if you misplace the file or mnemonic.**
+**NOTE: We strongly recommend only creating a new wallet on a hardware wallet or on a secure, airgapped computer. You are responsible for safely storing your mnemonic and wallet files. Your mnemonic is the ONLY way to restore access to your wallet and accounts if you misplace the wallet file, so it's essential that you back it up securely and reliably. There is absolutely nothing that we can do to help you recover your wallet if you misplace the file or mnemonic.**