Add example config file.

config

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+# set the image name
+IMG_NAME="Piradio"
+
+# set to 1 to zip the image
+DEPLOY_ZIP="0"
+
+# set the OS user and password
+FIRST_USER_NAME="radio"
+FIRST_USER_PASS="radio"
+
+# set to 1 to enable SSH
+ENABLE_SSH="0"
+
+# wifi settings
+WPA_ESSID="your wifi name"
+WPA_PASSWORD="your wifi password"
+WPA_COUNTRY="your country code, eg: GB, US..."