adds more documentation

NeverMore/V5_Duo/README.md

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+# Nevermore Micro - V5 Duo
+
+A directory of files and folders is listed below.
+
+TODO...

NeverMore/V5_Duo/V2/Readme.md

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+Four parts; Plenum+Lid, and Cartridge+Lid.
+
+Choose between regular and XL cartridge. XL is just 10mm longer, which can make a big difference in air flow.
+
+Choose XL for max carbon content and filter duration, and if you dont mind the fan (200Pa+) has to run faster/noisier. You probably have to use pellets instead of granular carbon too.
+
+Choose regular if you have granular carbon and/or a wekaer fan, and/or wish to have a more silent experience. Regular also allows for somewhat higher airflow, which could make a small difference compared to XL in chamber heat up times.