Initial project import

tools/v/vlib/x/dataframe/README.md

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+# DataFrame
+
+`x.dataframe` provides a small experimental tabular data API. It is intended as
+a foundation for data analysis workflows that need DataFrame-style operations
+without leaving V.
+
+The module stores cells as strings and provides numeric helpers on `Series` for
+common analysis tasks.
+
+```v
+import x.dataframe
+
+const prices = 'symbol,price,qty
+AAPL,189.5,2
+MSFT,420.25,3
+'
+
+fn main() {
+	df := dataframe.from_csv(prices, dataframe.CsvConfig{})!
+	println(df.shape())
+
+	price := df.column('price')!
+	println(price.mean()!)
+
+	liquid := df.filter(fn (row dataframe.Row) bool {
+		return row.values['qty'].int() >= 3
+	})
+	println(liquid.rows)
+}
+```
+
+## Features
+
+- Load tabular data from CSV strings or files.
+- Access cells, rows, and columns by name.
+- Select columns and filter rows.
+- Sort by string or numeric column values.
+- Count distinct column values.
+- Calculate `sum`, `mean`, `min`, `max`, `median`, `stddev`, and `describe`
+  summaries for numeric columns.
+
+The API is experimental and may change while the module is under `x`.