init research

dataframe/docs/StardustDocs/topics/info.md

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+[//]: # (title: General info)
+
+<!---IMPORT org.jetbrains.kotlinx.dataframe.samples.api.Analyze-->
+
+General information about [`DataFrame`](DataFrame.md):
+* [`count`](count.md) / [`rowsCount()`](rowsCount.md) — number of rows
+* [`countDistinct()`](countDistinct.md) — number of distinct rows
+* [`columnsCount()`](columnsCount.md) — number of columns
+* [`columnNames()`](columnNames.md) — list of column names
+* [`columnTypes()`](columnTypes.md) — list of column types
+* [`head(n)`](head.md) — first n rows (default 5)
+* [`schema()`](schema.md) — schema of columns
+* [`describe()`](describe.md) — general statistics for every column