Add Xiaomi Mi Max 3

Change-Id: I724ce7a9141265295fe1238200fdeeba43f97b78
diff --git a/_xiaomi/xiaomimimax3.markdown b/_xiaomi/xiaomimimax3.markdown
new file mode 100644
index 0000000..dfe30bc
--- /dev/null
+++ b/_xiaomi/xiaomimimax3.markdown
@@ -0,0 +1,31 @@
+---
+layout: device
+title:  "Xiaomi Mi Max 3"
+codename: nitrogen
+downloadfolder: nitrogen
+supportstatus: Current
+maintainer: ROMFACTORY
+devicetree: https://github.com/TeamWin/android_device_xiaomi_nitrogen.git
+oem: Xiaomi
+ddof: "/dev/block/bootdevice/by-name/recovery"
+xdathread: "https://forum.xda-developers.com/mi-max-3/development/official-twrp-3-2-x-xiaomi-mi-max-3-t3825561"
+---
+
+{% include disclaimer.html %}
+
+{% include supportstatus.html %}
+
+{% include dmverity.html %}
+
+{% include xiaomiunlock.html %}
+
+{% include appinstall.html %}
+
+{% include download.html %}
+
+{% include twrpinstall.html %}
+
+{% include fastbootinstall.html %}
+
+{% include ddinstall.html %}
+