NetTiSA: Add NetTiSA into README.md

Author: SiskaPavel

README.md

@@ -239,6 +239,25 @@ Fields without `_REV` suffix are fields from source flow. Fields with `_REV` are
 | TCP_MSS_REV  | uint32 | TCP maximum segment size    |
 | TCP_SYN_SIZE | uint16 | TCP SYN packet size         |
 
+### NetTiSA
+List of unirec fields exported together with NetTiSA flow fields on interface by nettisa plugin.
+
+| Output field | Type   | Description                 |
+|:------------:|:------:|:---------------------------:|
+| NTS_MEAN               | float   |  The mean of the payload lengths of packets                                   |
+| NTS_MIN                | uint16   |  Minimal value from all packet payload lengths                |
+| NTS_MAX                | uint16   |  Maximum value from all packet payload lengths                    |
+| NTS_STDEV              | float   |  Represents a switching ratio between different values of the sequence of observation.                    |
+| NTS_KURTOSIS           | float  |  The standard deviation is measure of the variation of data from the mean.             |
+| NTS_ROOT_MEAN_SQUARE   | float  |  The measure of the magnitude of payload lengths of packets.             |
+| NTS_AVERAGE_DISPERSION | float  |  The average absolute difference between each payload length of packet and the mean value.        |
+| NTS_MEAN_SCALED_TIME   | float  |  The kurtosis is the measure describing the extent to which the tails of a distribution differ from the tails of a normal distribution.   |
+| NTS_MEAN_DIFFTIMES     | float  | The scaled times is defined as sequence $\{st\} = \{ t_1 - t_1, t_2 - t_1, \dots, t_n - t_1 \}$. We compute the mean of the value with same method as for feature \textit{Mean}.     |
+| NTS_MIN_DIFFTIMES      | float  | The time differences is defined as sequence $ \{dt\} = \{ t_j - t_i \| j = i + 1, i \in \{1, 2, \dots, n - 1\}\}$. We compute the mean of the value with same method as for feature \textit{Mean}.     |
+| NTS_MAX_DIFFTIMES      | float  | Minimal value from all time differences, i.e., min space between packets.          |
+| NTS_TIME_DISTRIBUTION  | float  | Maximum value from all time differences, i.e., max space between packets.          |
+| NTS_SWITCHING_RATIO    | float  | Describes the distribution of time differences between individual packets.          |
+
 ### HTTP
 List of unirec fields exported together with basic flow fields on interface by HTTP plugin.