Add ns-viewer docs (#1450)

docs/reference/cli/index.md

@@ -12,6 +12,7 @@ Here are the popular commands that we offer. If you've cloned the repo, you can
 | ns-process-data  | Generate a dataset from your own data  | scripts/process_data.py            |
 | ns-download-data | Download existing captures             | scripts/downloads/download_data.py |
 | ns-train         | Generate a NeRF                        | scripts/train.py                   |
+| ns-viewer        | View a trained NeRF                    | scripts/viewer/run_viewer.py       |
 | ns-eval          | Run evaluation metrics for your Model  | scripts/eval.py                    |
 | ns-render        | Render out a video of your NeRF        | scripts/render.py                  |
 | ns-export        | Export a NeRF into other formats       | scripts/exporter.py                |
@@ -24,6 +25,7 @@ ns_process_data
 ns_download_data
 ns_train
 ns_render
+ns_viewer
 ns_export
 ns_eval
 ```

docs/reference/cli/ns_viewer.md

@@ -0,0 +1,9 @@
+# ns-viewer
+
+```{eval-rst}
+.. argparse::
+    :module: scripts.viewer.run_viewer
+    :func: get_parser_fn
+    :prog: ns-viewer
+    :nodefault:
+```