Add some documentation

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diff --git a/accounts/scwallet/README.md b/accounts/scwallet/README.md
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+# Using the smartcard wallet
+
+## Requirements
+
+  * A USB smartcard reader
+  * A keycard that supports the status app
+
+## Usage
+
+  1. Start `geth` with the `console` command
+  2. Check the card's URL by checking `personal.listWallets`:
+
+```
+  listWallets: [{
+      status: "Online, can derive public keys",
+      url: "pcsc://a4d73015"
+  }]
+```
+
+  3. Open the wallet, you will be prompted for your pairing password, then PIN:
+
+```
+personal.openWallet("pcsc://a4d73015")
+```
+
+  4. Check that creation was successful by typing e.g. `personal`. Then use it like a regular wallet.
+
+## Known issues
+
+  * Starting geth with a valid card seems to make firefox crash
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