Implement simple input layer

include/layers/input.cuh

@@ -0,0 +1,30 @@
+#ifndef INPUT_LAYER_H
+#define INPUT_LAYER_H
+
+#include <ilayer.cuh>
+
+namespace Layers {
+
+class Input : public ILayer {
+  public:
+    Input(int inputSize);
+    ~Input();
+
+    float* forward(const float* input);
+
+    void setWeights(const float* weights);
+    void setBiases(const float* biases);
+
+  private:
+    void initializeWeights();
+    void initializeBiases();
+
+    void toCuda();
+
+    int    inputSize;
+    float* d_output;
+};
+
+}  // namespace Layers
+
+#endif  // INPUT_LAYER_H