Merge branch 'add_plexon1_data' of NeuralEnsemble/ephy_testing_data into master

plexon/4chDemoPLX.plx

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+/annex/objects/MD5E-s11621412--0421a88bd693aa80902f636a5ab8637e.plx

plexon/README.md

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 # Format test files from [Plexon](https://plexon.com/) electrophysiology recording systems
 
+
+## File_Plexon_{}.plx
+Plexon 1 files. Some comments on them:
+
+- Plexon 1: does not have signal channels, only spikes
+- Plexon 2: does not have signa channels, only spikes
+- Plexon 3: has only one signal channel with channel name "V1"
+
 ## `4chDemoPL2.pl2`
 This file is taken from the [Plexon website](https://plexon.com/wp-content/uploads/2017/08/4chTetrodeDemoPL2.pl2) and contains data of a four channel tetrode: PL2 file with one tetrode channel of sorted spikes, continuous wideband, and continuous field potentials. 16 channels of events. One channel of strobed data that increments in value from 32513 to 32767. One channel of auxiliary analog input. See also the [data samples provided by plexon](https://plexon.com/software-downloads/#software-downloads-data-samples)
+
+
+## 4chDemoPLX.plx
+Taken from the Plexon site same as above but in PLX (plexon 1) format.