add oneplus3 support

* asserts taken from https://github.com/LineageOS/android_device_oneplus_oneplus3/blob/e975bda0561217fae2a342c2e8c1848b3e3cf370/BoardConfig.mk#L35C29-L35C66
* copied config from cheeseburger

Signed-off-by: SirRGB <[email protected]>

Author: SirRGB

README.md

@@ -163,6 +163,7 @@ Motorola | moto z | [griffin](https://wiki.lineageos.org/devices/griffin) | XT16
 Vendor | Device Name | CodeName | Models | Status
 ---|---|---|---|---
 OnePlus | One | [bacon](https://wiki.lineageos.org/devices/bacon) | A0001 | tested
+OnePlus | 3/3T | [oneplus3](https://wiki.lineageos.org/devices/oneplus3) | A3003, A3000, A3010 | untested
 OnePlus | 5 | [cheeseburger](https://wiki.lineageos.org/devices/cheeseburger) | A5000 | tested
 OnePlus | 5T | [dumpling](https://wiki.lineageos.org/devices/dumpling) | A5010 | tested
 OnePlus | 6 | [enchilada](https://wiki.lineageos.org/devices/enchilada) | A6000, A6003 | tested

openandroidinstaller/assets/configs/oneplus3.yaml

@@ -0,0 +1,41 @@
+metadata:
+  maintainer: SirRGB
+  device_name: OnePlus 3/3T
+  is_ab_device: false
+  device_code: oneplus3
+  supported_device_codes:
+    - OnePlus3
+    - oneplus3
+    - OnePlus3T
+    - oneplus3t
+  untested: true
+requirements:
+  android: 9
+steps:
+  unlock_bootloader:
+    - type: call_button
+      content: >
+        As a first step, you need to unlock the bootloader. A bootloader is the piece of software, that tells your phone
+        how to start and run an operating system (like Android). Your device should be turned on.
+        Press 'Confirm and run' to reboot into the bootloader.
+      command: adb_reboot_bootloader
+    - type: call_button
+      content: >
+        In this step you actually unlock the bootloader. Just press 'Confirm and run' here. The phone will automatically reboot and reformat.
+        Once it's done, press continue here.
+      command: fastboot_oem_unlock
+    - type: confirm_button
+      content: >
+        The bootloader is now unlocked. Since the device resets completely, you will need to re-enable Developer Options and USB debugging to continue.
+  boot_recovery:
+    - type: call_button
+      content: >
+        Now you need to boot a custom recovery system on the phone. A recovery is a small subsystem on your phone, that manages updating,
+        adapting and repairing of the operating system.
+        Make sure your device is turned on. You need to reboot into the bootloader again by pressing 'Confirm and run' here. Then continue.
+      command: adb_reboot_bootloader
+    - type: call_button
+      img: twrp-start.jpeg
+      content: >
+        Boot a custom recovery (temporarily) by pressing 'Confirm and run'. Once it's done continue.
+      command: fastboot_boot_recovery