Add initial Cupcake docs

docs/cupcake/cupcake.md

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+---
+title: "Cupcake"
+has_children: true
+nav_order: 4
+---
+
+# Cupcake
+
+{: .note}
+Cupcake is currently in BETA and is not recommended unless you know are familiar with air-gapped wallets and can self-troubleshoot.
+Please do NOT open a support ticket for Cupcake at this time.
+
+Cupcake is an air-gapped wallet using live QR codes.
+
+It works similarly to a hardware wallet, separating the private keys from the main wallet app and becoming a dedicated transaction signer.
+
+Cupcake contains the private wallet keys for transaction signing, whereas Cake Wallet has only the view keys necessary to see balance, transactions, and generate transactions for Cupcake to sign.
+
+## Download
+
+Cupcake can be downloaded from the [App Store](https://apps.apple.com/eg/app/cupcake-by-cake-wallet/id6737430272){:target="_blank"}, [Play Store](https://play.google.com/store/apps/details?id=com.cakewallet.cupcake), and the [GitHub repo](https://github.com/cake-tech/cupcake/releases).
+
+Cupcake is currently only supported on iOS and Android.
+
+## Cryptos
+
+Cupcake currently supports Monero.
+
+More cryptocurrencies will be supported in the future.

docs/cupcake/setup.md

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+---
+layout: default
+title: "Setup"
+parent: Cupcake
+---
+
+# Setup
+
+## Step 1
+
+Create or Restore your first wallet from the setup wizard.
+
+[![Splash](splash.png){:width="32%"}](splash.png)
+[![Create wallet](create-wallet.png){:width="32%"}](create-wallet.png)
+
+## Step 2
+
+Once you've created or restored a wallet, you'll need to restore the view-only wallet to Cake Wallet.
+
+To restore the view-only wallet, open the `Menu`, select `Security and backup`, then select `Restore View-Only Wallet` from the bottom of the page.
+
+[![Menu](menu.png){:width="32%"}](menu.png)
+[![Restore View-Only Wallet](restore-qr.png){:width="32%"}](restore-qr.png)
+
+## Step 3
+
+From Cake Wallet, enter the `Wallets` screen from either the Menu or the button on the bottom bar. Select `Restore Wallet`, then select `Scan QR code`. Scan the view-only wallet QR code from Cupcake.
+
+[![Menu](cw-menu.png){:width="32%"}](cw-menu.png)
+[![Restore wallet](cw-wallets.png){:width="32%"}](cw-wallets.png)
+[![Scan QR code](cw-restore.png){:width="32%"}](cw-restore.png)
+
+### Synchronizing balance
+
+If you're restored an existing wallet with transactions, you'll need to synchronize the balance after scanning the blockchain from Cake Wallet.
+
+You can do this by `exporting outputs` from Cake Wallet, then scanning the `key images` from Cupcake.
+
+From Cake Wallet, open the `Menu`, select `Export outputs`. Scan the live QR from Cupcake. If successful, Cupcake will present a QR with the `key images`. Scan this from Cake Wallet.