Update readme with Spectravel part

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 # SPDX-License-Identifier: Apache-2.0
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+# Spectravel - Spectrometer on Caravel  
+
+Spectravel consists of digital spectrometer generator designed in Chisel hardware design language connected via Wishbone to AXI4 bridge to the caravel. Block diagram of the Spectravel is given below and detailed explanation can be found [here](https://github.com/milovanovic/caravel_spectrometer/tree/master/cargo)
+
+![Global block scheme of the Spectravel](./cargo/doc/SpectrometerTest.svg)
+
+The original Caravel documentation follows:
+
 # CIIC Harness  
 
 A template SoC for Google SKY130 free shuttles. It is still WIP. The current SoC architecture is given below.