add readme

typescript/README.md

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+# Toy implementation of Neural Network evaluation in multiple languages
+
+Neural network trained with pytorch:
+```python
+class Network(nn.Module):
+    def __init__(self):
+        super().__init__()
+        self.hidden = nn.Linear(6, 50)
+        self.output = nn.Linear(50, 3)
+
+        self.sigmoid = nn.Sigmoid()
+        self.relu = nn.ReLU()
+
+    def forward(self, x):
+        x = self.hidden(x)
+        x = self.relu(x)
+        x = self.output(x)
+        x = self.sigmoid(x)
+
+        return x
+```
+
+Proper solution (typescript version): https://nn.lw1.at/