Adding README for etrace

etrace/README.md

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+ETRACE INTRODUCTION
+=====================================
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+The "etrace" module is a simple parametrized logic analyzer that captures a set of input signals in dual ported memory. Captured values can be read out through a memory mapped interface. Each sampled value is stored together with a counter time stamp. The vector is sampled on the rising edge of "trace_clk".
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+## USAGE
+1. Instantiate in block and hook up signals. Use the dv/dut_etrace.v as an example
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+2. Enable the tracer by setting the trace_trigger to high AND setting bit[0] of the ETRACE_CFG register(810F00000).
+
+3. (sample signals for as long as you want)
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+4. Read back values through the mi interface: 810A00000,810A00004,etc
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