Implement max pooling layer

include/kernels/pooling.cuh

@@ -0,0 +1,30 @@
+#ifndef CUDANET_POOLING_H
+#define CUDANET_POOLING_H
+
+#include <cuda_runtime.h>
+
+namespace CUDANet::Kernels {
+
+__global__ void max_pooling(
+    const float* __restrict__ d_input,
+    float* __restrict__ d_output,
+    const int inputSize,
+    const int nChannels,
+    const int poolingSize,
+    const int stride,
+    const int paddingSize
+);
+
+__global__ void avg_pooling(
+    const float* __restrict__ d_input,
+    float* __restrict__ d_output,
+    const int inputSize,
+    const int nChannels,
+    const int poolingSize,
+    const int stride,
+    const int paddingSize
+);
+
+}  // namespace CUDANet::Kernels
+
+#endif // CUDANET_POOLING_H