feat: encoder skeleton code

models/autoencoder.py

@@ -0,0 +1,18 @@
+import torch
+import torch.nn as nn
+
+
+class Encoder(nn.Module):
+    def __init__(self, input_size, hidden_size, output_size):
+        super(Encoder, self).__init__()
+
+    def forward(self, x: torch.Tensor) -> torch.Tensor:
+        pass
+
+
+class Decoder(nn.Module):
+    def __init__(self):
+        super(Decoder, self).__init__()
+
+    def forward(self, x: torch.Tensor) -> torch.Tensor:
+        pass