Missing markdown for Unihertz.

Change-Id: I222ec023e33391d1219f6cfc660d3893fa0046fe
diff --git a/oem/unihertz.markdown b/oem/unihertz.markdown
new file mode 100644
index 0000000..3bffb72
--- /dev/null
+++ b/oem/unihertz.markdown
@@ -0,0 +1,4 @@
+---
+layout: device
+oem: Unihertz
+---