Skeleton Site Layout for //docs/ui

Change-Id: Ib66426dadaaa68800c818d00457ebafe73d0e4ce
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2153572
Commit-Queue: Robert Liao <[email protected]>
Commit-Queue: Peter Kasting <[email protected]>
Auto-Submit: Robert Liao <[email protected]>
Reviewed-by: Peter Kasting <[email protected]>
Cr-Commit-Position: refs/heads/master@{#759763}
diff --git a/docs/ui/learn/index.md b/docs/ui/learn/index.md
new file mode 100644
index 0000000..0a38a5c
--- /dev/null
+++ b/docs/ui/learn/index.md
@@ -0,0 +1,4 @@
+# Learning about Chromium UI
+
+# Architecture Overview
+Coming soon.