Offline mode implemented

README

@@ -16,6 +16,7 @@ similar third-party projects.
 * Sending TRX/USDT/USDC on all supported networks
 * Freezing (for energy) and unfreezing TRX on all supported networks
 * Ability to connect to custom nodes or TronGrid API (with your own API key)
+* Offline mode for send/freeze/unfreeze transactions
 * No filesystem interaction (that's a feature, not a bug: see the FAQ section)
 * Full scriptability: send/freeze/unfreeze transactions require manual approval
   but it actually can be turned off with a special commandline parameter for the
@@ -145,9 +146,25 @@ Again, the amount of TRX is entered as a floating point value.
 
 Keep in mind that it takes up to 72 hours to unfreeze your TRX assets.
 
+-- Offline operations --
+
+The send trx, send usdt, send usdc, fre trx and unf trx subcommands support the
+-o flag that, after the "Success:" line, outputs a JSON of a signed transaction.
+You can copy or otherwise transfer this output to a different machine running
+kisstron and broadcast it to the network with bro trx subcommand:
+
+./kisstron.py bro trx [netopts]
+
+You can then paste the transaction JSON into the input field, press Enter and,
+unless -nc flag is passed too, confirm sending the transaction by entering yes.
+The transaction will be broadcast and processed as usual.
+
+Keep in mind that Tron transactions expire very quickly, so you have a limited
+time window between signing and publishing them.
+
 == FAQ ==
 
-- Can I trust it?
+- Can I trust this wallet?
 
 The author trusts it. In fact, kisstron was created because of lack of decent
 FOSS Tron wallets for Linux/BSD desktop operating systems. However, it cannot
@@ -179,9 +196,8 @@ No. The underlying tronpy library signs all transactions offline, so the
 private key never leaves your machine. It uses libsecp256k1 via coincurve
 library binding for transaction signing.
 
-Ability to implement offline mode (transactions are created and signed on one
-kisstron instance without Internet connectivity, then broadcast from another)
-in the future versions is being studied.
+You can also use offline mode to split signing and sending transactions, as
+shown in this document.
 
 - Why doesn't kisstron support TRC-10, multisig, witnesses, history etc?