Update metadata with RobustScaler preprocessing info

metadata.json

@@ -0,0 +1,23 @@
+{
+  "compression_mode": "samples",
+  "latent_dims": 4,
+  "preprocessing_method": "robust",
+  "preprocessing_quantile_range": [
+    5.0,
+    95.0
+  ],
+  "norm_range": [
+    -1,
+    1
+  ],
+  "n_samples": 1050,
+  "n_features": 20136,
+  "pca_explained_variance": [
+    0.15058058614897432,
+    0.07173255882978682,
+    0.049192590371805796,
+    0.04009109228884122
+  ],
+  "has_umap": true,
+  "n_genes": 20136
+}