Add config.json (enables HF download tracking + removes hardcoded hyperparams from Quickstart)

config.json

@@ -0,0 +1,13 @@
+{
+  "architecture": "Histoformer",
+  "inp_channels": 3,
+  "out_channels": 3,
+  "dim": 36,
+  "num_blocks": [4, 4, 6, 8],
+  "num_refinement_blocks": 4,
+  "heads": [1, 2, 4, 8],
+  "ffn_expansion_factor": 2.667,
+  "bias": false,
+  "LayerNorm_type": "WithBias",
+  "dual_pixel_task": false
+}