update doc for Oppo K3

README.md

@@ -82,6 +82,7 @@ We now support both VB 1.0 and AVB 2.0 layouts.
 |--------------------------------|--------------|----------------------|--------------------------|------|
 | Pixel 3 (blueline)             | Google       | Y                    | Q preview (qpp2.190228.023, <Br>2019)| [more ...](doc/additional_tricks.md#pixel-3-blueline) |
 | Pixel XL (marlin)              | HTC          | Y                    | 9.0.0 (PPR2.180905.006, <Br>Sep 2018)| [more ...](doc/additional_tricks.md#pixel-xl-marlin) |
+| K3 (CPH1955)                   | OPPO         | Y for recovery.img<Br> N for boot.img  | Pie    | [more](doc/additional_tricks.md#k3-cph1955) |
 | Z18(NX606J)                    | ZTE          | Y                    | 8.1.0                    | [more...](doc/additional_tricks.md#nx606j) |
 | Nexus 9 (volantis/flounder)    | HTC          | Y(with some tricks)  | 7.1.1 (N9F27M, Oct 2017) | [tricks](doc/additional_tricks.md#tricks-for-nexus-9volantis)|
 | Nexus 5x (bullhead)            | LG           | Y                    | 6.0.0_r12 (MDA89E)       |      |

doc/additional_tricks.md

@@ -49,7 +49,9 @@ ROM download page: [http://ui.nubia.cn/rom/detail/56](http://ui.nubia.cn/rom/det
 
 ## K3 (CPH1955)
 
-`boot.img` extracted from OTA ozip file doesn't work properly but `recovery.img` works fine. In order to obtain `recovery.img`, a `bsdiff` patch from `system/recovery-from-boot.p` is applied to `boot.img`. Ex: ```bspatch boot.img recovery.img system/recovery-from-boot.p```
+`boot.img` extracted from OTA zip file doesn't work properly but `recovery.img` works fine. In order to obtain `recovery.img`, a `bsdiff` patch from `system/recovery-from-boot.p` is applied to `boot.img`. Ex: ```bspatch boot.img recovery.img system/recovery-from-boot.p```
+
+This part is contributed by @Surendrajat, thanks!
 
 ## about porting