add app doc

docs/CARD_ANDROID.md

@@ -0,0 +1,61 @@
+# Steps for making a bolt card with the Android app
+
+## Introduction
+
+Here we describe how to create your own bolt card.
+
+## Resources
+ 
+- an Android device with NFC
+- the BoltCard app
+- [app usage document](https://github.com/boltcard/bolt-nfc-android-app#usage)
+
+## Steps
+
+### Install the app
+
+[Bolt Card Android app](https://github.com/boltcard/bolt-nfc-android-app)  
+- install the app from source or apk  
+
+### Write to the card
+- open the app
+- select `Write NFC` 
+- enter your domain and path in the text entry box given
+```
+card.yourdomain.com/ln
+```
+- bring the card to the device for programming the URI template  
+
+- select `Read NFC`
+- check that the URI looks correct
+```
+lnurlw://card.yourdomain.com/ln?c=...&p=...
+```
+- note the UID value
+
+### Get the keys from the host
+- on the bolt card server
+- enter the `createboltcard` directory
+- `$ go build`
+- `./createboltcard`
+- this will give you a one use link in text and QR code form  
+
+- on the app
+- select `Key Management`
+- click `scan QR code from console`
+- scan the QR code
+- bring the card to the device for programming the keys
+
+### Update the host card record
+- on the bolt card server
+- `$ psql card_db`
+- `card_db=# select card_id, one_time_code from cards order by card_id desc limit 1;`
+- check that this is the correct record
+- `card_db=# update cards set uid = '*UID value from before without the 0x prefix*' where card_id=*card_id from before*;`
+- `card_db=# update cards set enabled = 'Y' where card_id=*card_id from before*;`
+
+### Make a payment
+- monitor the bolt card service logs
+- `$ journalctl -u boltcard.service -f`
+- use a PoS setup to read the bolt card, e.g. [Breez wallet](https://breez.technology/)
+- for more support options, see [Bolt card service installation](INSTALL.md)