add help docs and ?

docs/nodes/Resample.md

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+# Resample
+
+Resample a DATA_FIELD to a new pixel resolution while preserving physical dimensions. Physical size (xreal, yreal) is unchanged; pixel size dx/dy scales accordingly. Equivalent to gwy_data_field_new_resampled.
+
+## Inputs
+
+| Name | Type | Required | Description |
+|------|------|----------|-------------|
+| field | DATA_FIELD | Yes | Input field to resample |
+
+## Outputs
+
+| Name | Type | Description |
+|------|------|-------------|
+| resampled | DATA_FIELD | Resampled field at the new resolution |
+
+## Controls
+
+| Name | Type | Default | Description |
+|------|------|---------|-------------|
+| width | INT | 256 | Output pixel width (2–16384) |
+| height | INT | 256 | Output pixel height (2–16384) |
+| interpolation | dropdown | linear | Interpolation method: linear, cubic, or nearest |
+
+## Limitations
+
+- Physical dimensions are preserved; upsampling does not add new information.
+- Very large output sizes (e.g. 16384×16384) require substantial memory.