Add README.md to transition

Test: Only doc change
Change-Id: Iaf4eb699ab11f75ee9913eb1c825cd3be5c20b18
diff --git a/transition/README.md b/transition/README.md
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+# androidx.transition
+
+Transition API allows you to animate various kinds of layout changes automatically.
+
+[Library owners](OWNERS)
+
+[Release notes](https://developer.android.com/jetpack/androidx/releases/transition)
+
+[Browse source](https://android.googlesource.com/platform/frameworks/support/+/androidx-master-dev/transition/)
+
+[Reference documentation](https://developer.android.com/reference/androidx/transition/package-summary)
+
+[Existing open bugs](https://issuetracker.google.com/issues?q=componentid:460400%20status:open)
+
+[File a new bug](https://issuetracker.google.com/issues/new?component=460400)