first stab at hwcomposer HAL and default implementation.

Change-Id: I7ff47b94a6b34a8f61031bd94e936a088dcea6ab
diff --git a/modules/hwcomposer/README.android b/modules/hwcomposer/README.android
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index 0000000..4aa7203
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+Skeleton for the "hwcomposer" HAL module.
+