Add np.add and np.random.uniform

Author: MPnoy

src/TensorFlowNET.Core/NumPy/Implementation/RandomizedImpl.cs

@@ -43,5 +43,9 @@ public NDArray randn(params int[] shape)
         [AutoNumPy]
         public NDArray normal(float loc = 0.0f, float scale = 1.0f, Shape size = null)
             => new NDArray(random_ops.random_normal(size ?? Shape.Scalar, mean: loc, stddev: scale));
+
+        [AutoNumPy]
+        public NDArray uniform(float low = 0.0f, float high = 1.0f, Shape size = null)
+            => new NDArray(random_ops.random_uniform(size ?? Shape.Scalar, low, high));
     }
 }

src/TensorFlowNET.Core/NumPy/Numpy.Math.cs

@@ -52,5 +52,8 @@ public static NDArray prod<T>(params T[] array) where T : unmanaged
 
         [AutoNumPy]
         public static NDArray sum(NDArray x1, Axis? axis = null) => new NDArray(tf.math.sum(x1, axis));
+
+        [AutoNumPy]
+        public static NDArray add(NDArray x, NDArray y) => new NDArray(math_ops.add(x, y));
     }
 }