Added datagridviewer readme

Author: dsblank

panels/DataGridViewer/README.md

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+### DataGridViewer
+
+The `DataGridViewer` panel is used to visualize Comet `DataGrids` which
+can contain Images, text, and numeric data.
+
+The UX is a sophisticated approach to grouping data to see (and select)
+images and other data in a tabular format, with a search feature that
+allows fast querying of the data (including metadata) using Python syntax.
+
+#### Snapshots
+
+<table>
+<tr>
+<td>
+<img src="https://raw.githubusercontent.com/comet-ml/comet-examples/refs/heads/master/panels/DataGridViewer/tabular-view.png" 
+     style="max-width: 300px; max-height: 300px;">
+</img>
+</td>
+<td>
+<img src="https://raw.githubusercontent.com/comet-ml/comet-examples/refs/heads/master/panels/DataGridViewer/group-by.png" 
+     style="max-width: 300px; max-height: 300px;">
+</img>
+</td>
+<td>
+<img src="https://raw.githubusercontent.com/comet-ml/comet-examples/refs/heads/master/panels/DataGridViewer/image-dialog.png" 
+     style="max-width: 300px; max-height: 300px;">
+</img>
+</td>
+</tr>
+</table>
+
+#### Example Code
+
+```
+%pip install comet_ml datagrid
+
+import comet_ml
+from datagrid import DataGrid, Image
+import requests
+
+experiment = comet_ml.start(
+    project_name="demo-datagrids"
+)
+dg = DataGrid(
+    columns=["Image", "Score", "Category"],
+    name="Demo"
+)
+url = f"https://picsum.photos/300/200"
+for i in range(50):
+    im = PImage.open(requests.get(url, stream=True).raw)
+    category = random.choice(categories)
+    score = random.random()
+    label = random.choice(items)
+    image = Image(
+        im,
+        metadata={"category": category, "score": score},
+    )
+    dg.append([image, score, category])
+
+dg.log(experiment)
+experiment.end()
+```
+
+#### Resources
+
+* Copy panel to workspace:
+  * `cometx log YOUR-WORKSPACE DataGridViewer --type panel`
+  * Via code (see notebook below)
+* Example notebook: [DataGridViewer.ipynb](https://github.com/comet-ml/comet-examples/blob/master/panels/DataGridViewer/DataGridViewer.ipynb)
+  * [Run in colab](https://colab.research.google.com/github/comet-ml/comet-examples/blob/master/panels/DataGridViewer/DataGridViewer.ipynb)
+  * [Open in NBViewer](https://nbviewer.org/github/comet-ml/comet-examples/blob/master/panels/DataGridViewer/DataGridViewer.ipynb)
+* Example Comet Project: [www.comet.com/examples/comet-example-datagrid](https://www.comet.com/examples/comet-example-datagrid/view/dVz9h6RFURYwHVQcgXvJ3RWqU/panels)
+* Documentation: 
+  * [DataGrid](https://github.com/dsblank/datagrid)
+  * [Search syntax](https://github.com/dsblank/datagrid/blob/main/Search.md)