[flexiglass] Adds AOSP documentation.

Bug: 283121968
Change-Id: I6e81cadf09b7727ea5ec91c8bfa09a0f9d2c6909
Flag: N/A
Test: N/A
diff --git a/packages/SystemUI/docs/imgs/ribbon.png b/packages/SystemUI/docs/imgs/ribbon.png
new file mode 100644
index 0000000..9f57652
--- /dev/null
+++ b/packages/SystemUI/docs/imgs/ribbon.png
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