Update README.md

README.md

@@ -1 +1,11 @@
-# device_xiaomi_cactus
+# device_xiaomi_cactus
+## How to build TWRP from official repo?
+1) mkdir twrp && cd twrp
+2) repo init -u git://github.com/minimal-manifest-twrp/platform_manifest_twrp_omni.git -b twrp-9.0
+3) repo sync
+4) git clone https://github.com/recovery-xiaomi-mt6765/device_xiaomi_cactus -b master device/xiaomi/cactus
+5) export ALLOW_MISSING_DEPENDENCIES=true
+6) . build/envsetup.sh
+7) lunch omni_cactus-eng
+8) mka recoveryimage
+### Out file twrp/out/target/product/cactus/recovey.img