Update metadata with RobustScaler preprocessing info

metadata.json

@@ -0,0 +1,22 @@
+{
+  "compression_mode": "samples",
+  "latent_dims": 3,
+  "preprocessing_method": "robust",
+  "preprocessing_quantile_range": [
+    5.0,
+    95.0
+  ],
+  "norm_range": [
+    -1,
+    1
+  ],
+  "n_samples": 1050,
+  "n_features": 20136,
+  "pca_explained_variance": [
+    0.1505805861489747,
+    0.07173255882979271,
+    0.04919259037077066
+  ],
+  "has_umap": true,
+  "n_genes": 20136
+}