Greatlte support (first part) (#87)

Created Yaml with right text instructions for greatlte

Yet TODO : create the image for models with Bixby buttons on reboot from
download step

Did not test the unlock bootloader

Author: tsterbak

README.md

@@ -82,6 +82,7 @@ Samsung | Galaxy S6 Edge | [zeroltexx](https://wiki.lineageos.org/devices/zerolt
 Samsung | Galaxy S7 | [herolte](https://wiki.lineageos.org/devices/herolte/) | SM-G930F | tested
 Samsung | Galaxy S7 Edge | [hero2lte](https://wiki.lineageos.org/devices/hero2lte/) | | tested
 Samsung | Galaxy S9 | [starlte](https://wiki.lineageos.org/devices/starlte/) | | tested
+Samsung | Galaxy Note 8 | greatlte | SM-N950F | tested
 Samsung | Galaxy Note 9 | [crownlte](https://wiki.lineageos.org/devices/crownlte/) | | tested
 Samsung | Galaxy S10 | [beyond1lte](https://wiki.lineageos.org/devices/beyond1lte/) | | tested
 Samsung | Galaxy S10e | [beyond0lte](https://wiki.lineageos.org/devices/beyond0lte/) | | tested

openandroidinstaller/assets/configs/greatlte.yaml

@@ -0,0 +1,21 @@
+metadata:
+  maintainer: Michel Memeteau (freechelmi)
+  devicename: Samsung Galaxy note 8
+  devicecode: greatlte 
+steps:
+  unlock_bootloader:
+  flash_recovery:
+    - type: call_button
+      content: >
+        As a first step, you need to boot into the bootloader. A bootloader is the piece of software, 
+        that tells your phone who to start and run an operating system (like Android). Your device should be turned on. 
+        Then press 'Confirm and run' to reboot into the bootloader. Continue once it's done.
+      command: adb_reboot_download
+    - type: call_button
+      content: In this step, you need to flash a custom recovery on your device. Press 'Confirm and run' to start the process. Confirm afterwards to continue.
+      command: heimdall_flash_recovery
+    - type: confirm_button
+      img: samsung-buttons.png
+      content: >
+        Unplug the USB cable from your device. Then manually reboot into recovery by pressing the *Volume Down* + *Power buttons* for 8~10 seconds 
+        until the screen turns black to reboot  & release the buttons immediately when it does, then immediately hold *Volume Up* + *Bixby* + *Power button* until you are in recovery mode.