doc: add pinephone to supported devices

doc/pinephone.md

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+# PinePhone and PinePhone Pro
+
+The PinePhone and PinePhone Pro both use a Qualcomm mdm9607 modem as part of their [Quectel EG25-G LTE module](https://www.quectel.com/product/lte-eg25-g/). The EG25-G has global LTE band support and contains a GNSS positioning module. Rayhunter does not currently make direct use of GNSS.
+
+The modem is fully capable of running Rayhunter, but lacks both a screen and a network connection. The modem exposes an AT interface that can enable adb.
+
+## Hardware
+- <https://pine64.org/devices/pinephone/>
+- <https://pine64.org/devices/pinephone_pro/>
+
+## Supported bands
+
+| Band | Frequency         |
+| ---- | ----------------- |
+|    1 | 2100 MHz (IMT)    |
+|    2 | 1900 MHz (PCS)    |
+|    3 | 1800 MHz (DCS)    |
+|    4 | 1700 MHz (AWS-1)  |
+|    5 | 850 MHz (CLR)     |
+|    7 | 2600 MHz (IMT-E)  |
+|    8 | 900 MHz (E-GSM)   |
+|   12 | 700 MHz (LSMH)    |
+|   13 | 700 MHz (USMH)    |
+|   18 | 850 MHz (LSMH)    |
+|   19 | 850 MHz (L800)    |
+|   20 | 800 MHz (DD)      |
+|   25 | 1900 MHz (E-PCS)  |
+|   26 | 850 MHz (E-CLR)   |
+|   28 | 700 MHz (APT)     |
+|   38 | 2600 MHz (IMT-E)  |
+|   39 | 850 MHz (E-CLR)   |
+|   40 | 2300 MHz (S-Band) |
+|   41 | 2500 MHz (BRS)    |
+
+Note that the Quectel EG25-G does not support LTE band 48 (CBRS 3500MHz), used in the US for unlicensed 4G/5G connectivity.
+
+## Installing
+```sh
+./installer pinephone
+```
+
+## Accessing rayhunter
+Because the modem does not have its own display or network interface, rayhunter is only accessible on the pinephone by forwarding tcp over adb.
+
+```sh
+adb forward tcp:8080 tcp:8080
+```
+
+## Shell access
+Use this command to enable adb access:
+
+```sh
+./installer util pinephone-start-adb
+adb shell
+```
+
+## Power saving (disable adb)
+The modem won't be able to sleep (power save) with adb enabled, even if Rayhunter is stopped. Disable adb with the following command:
+
+```sh
+./installer util pinephone-stop-adb
+```