Add dataset class distribution + sample grid

dataset/class_distribution.csv

@@ -1,12 +1,11 @@
-class,augmented_count,original_count
-Central Serous Chorioretinopathy [Color Fundus],606,101
-Diabetic Retinopathy,3444,1509
-Disc Edema,762,127
-Glaucoma,2880,1349
-Healthy,2676,1024
-Macular Scar,1937,444
-Myopia,2251,500
-Pterygium,102,17
-Retinal Detachment,750,125
-Retinitis Pigmentosa,834,139
-TOTAL,16242,5335
+class,original_count,augmented_count
+Central Serous Chorioretinopathy,101,606
+Diabetic Retinopathy,1509,3444
+Disc Edema,127,762
+Glaucoma,1349,2880
+Healthy,1024,2676
+Macular Scar,444,1937
+Myopia,500,2251
+Pterygium,17,102
+Retinal Detachment,125,750
+Retinitis Pigmentosa,139,834