add help docs and ?

docs/nodes/Float Slider.md

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+# Float Slider
+
+Interactive float slider node. Set min and max bounds, then drag the slider to output a FLOAT value.
+
+## Inputs
+
+None.
+
+## Outputs
+
+| Name | Type | Description |
+|------|------|-------------|
+| value | FLOAT | Current slider value |
+
+## Controls
+
+| Name | Type | Default | Description |
+|------|------|---------|-------------|
+| min_value | FLOAT | 0.0 | Lower bound of the slider range |
+| max_value | FLOAT | 1.0 | Upper bound of the slider range |
+| value | FLOAT (slider) | 0.5 | Current value within [min_value, max_value] |
+
+## Limitations
+
+- None.