Add Xiaomi Mi 9 markdown

Change-Id: I8c7b2f09d5dfcf4ddd6f7bb0041215549bc569c1
diff --git a/_xiaomi/xiaomimi9.markdown b/_xiaomi/xiaomimi9.markdown
new file mode 100644
index 0000000..1678dfa
--- /dev/null
+++ b/_xiaomi/xiaomimi9.markdown
@@ -0,0 +1,25 @@
+---
+layout: device
+title:  "Xiaomi Mi 9"
+codename: cepheus
+downloadfolder: cepheus
+supportstatus: Current
+maintainer: Mauronofrio
+devicetree: https://github.com/TeamWin/android_device_xiaomi_cepheus
+oem: Xiaomi
+xdathread: "https://forum.xda-developers.com/Mi-9/development/recovery-unofficial-twrp-xiaomi-mi-9-t3905825"
+---
+
+{% include disclaimer.html %}
+
+{% include supportstatus.html %}
+
+{% include xiaomiunlock.html %}
+
+{% include appinstall.html %}
+
+{% include download.html %}
+
+{% include twrpinstall.html %}
+
+{% include fastbootinstall.html %}