Expand README with more details

Change-Id: Ied171c3a96f077ed2c8cbbbf781fbeeaadeeff9a

README.md

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-Inception
+Inception: Towards a Nested Cloud Architecture
 =========
 
-Inception: Towards a Nested Cloud Architecture
+Inception Clouds are built entirely on top of the virtual resources
+acquired from today’s clouds, and provide nested VMs to end users.
+
+Inception Clouds enable:
+
+- Acceleration of continuous integration for open-source cloud
+  management software such as OpenStack
+
+- Hypervisor flexibility: VM live migration, VM replication for high
+  availability, instant VM spawning under high load demand, intrusion
+  detection by customizing Dom0 firewall...
+
+- App-specific resource allocation: customize subscription ratio, VM
+  consolidation
+
+- Low operation overhead: no physical metals, therefore no worry on
+  issues like cooling, power, cabling, rack design, malfunctioned
+  hardware replacement, data center real estate
+
+- Spanning across multiple providers: both private and public clouds
+  over geographically wide area
+
+Essentially, Inception Clouds enable entire control of your cloud,
+with even less operation overhead.
+
+For more information, please refer to our HotCloud'13 paper
+
+  http://www2.research.att.com/~changbl/pubs/Inception_Towards_a_Nested_Cloud_Architecture.pdf
+
+The code is rapidly evolving. Stay tuned!