README.md: Add note about blank screen workaround on OnePlus firmware

Issue: #8
Issue: #63
Issue: #100

Signed-off-by: Andrew Gunnerson <chillermillerlong@hotmail.com>

README.md

@@ -43,9 +43,10 @@ As the name alludes, BCR intends to be a basic as possible. The project will hav
 
 2. Install BCR as a system app.
 
-    **For devices rooted with Magisk**, simply flash the zip as a Magisk module from within the Magisk app.
+    * **For devices rooted with Magisk**, simply flash the zip as a Magisk module from within the Magisk app.
+        * **For OnePlus devices running the stock firmware (or custom firmware based on the stock firmware)**, also extract the `.apk` from the zip and install it manually before rebooting. This is necessary to work around a bug in the firmware where the app data directory does not get created, causing BCR to open up to a blank screen.
 
-    **For unrooted custom firmware**, the files from the `system/` folder in the zip will need to be baked into the system image (or otherwise made available on the actual `/system` volume).
+    * **For unrooted custom firmware**, the files from the `system/` folder in the zip will need to be baked into the system image (or otherwise made available on the actual `/system` volume).
 
 3. Reboot and open BCR.
 
@@ -150,4 +151,4 @@ If you are interested in implementing a new feature and would like to see it inc
 
 ### License
 
-BCR is licensed under GPLv3. Please see [`LICENSE`](./LICENSE) for the full license text.
+BCR is licensed under GPLv3. Please see [`LICENSE`](./LICENSE) for the full license text.