backup restore documentation

docs/recovery_from_backup.md

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+### Channel Fund Restore from the channel backup files
+
+#### Assumptions
+- The node has been restored with a LND's cipher seed mnemonic.
+- RTL generated channel backup file/s is available (all channel backup file is `channel-all.bak`).
+
+#### Steps to recover the funds
+- Create a `restore` folder in your backup location folder, as specified in the RTL config file.
+- Place the channel backup file in the `restore` folder.
+- Access the `Restore` page under the `Channels` section of RTL.
+- RTL will list the options to restore funds from the all channel file or individual channel backup file.
+- Click on the `Restore` button on the grid to restore the funds.
+- Once the restore function is executed successfully, RTL will rename the backup file and it will no longer be visible on the page.
+- Restore function will force close the channels and recover the funds from them.
+- The pending close channels can be viewed on the Pending page under `Channels`.
+- The corresponding pending on-chain transactions can also be viewed on the Transactions list under the `On-Chain` page.
+- Once the transactions are confirmed, the channels funds will be restored to your LND Wallet.