Adding text files for license and core intro.

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+novena_entropy
+==============
+This is an experimental HW system for the Novena platform.
+
+The purpose of the system is to debug, evaluate and qualify the
+avalanche Cryptech entropy providers for the Novena platform with the
+Xilinx Spartan-6 FPGA. The entropy providers being tested are the noise
+based entropy provider and the ring oscillator based entropy provider.
+
+The following cores are used in the system:
+  - core/coretest, the test command parser
+
+  - core/i2c, the serial interface that connects the system to the
+    Novena CPU.
+
+  - core/avalanche_entropy, the entropy provider that is driven by an
+    external noise source.
+
+  - core/rosc_entropy, the entropy provider driven by jitter between 32
+  independently running ring oscillators in the FPGA.
+
+Test SW is available in src/sw