Add some docs on the swaroop variant's differences.

diff --git a/doc/design/swaroop b/doc/design/swaroop
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index 0000000..01380b7
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+++ b/doc/design/swaroop
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+Things only in swaroop variant:
+
+Periodic check for a magic file being present.
+Periodic check for connected monitors' EDIDs.
+Player background image
+Fetching KDMs from a web service
+Player watermarking
+Restart after crash
+SPL support with unskippable content
+Player logging