NDArray: Added nd.flatten()

Author: Nucs

src/NumSharp.Core/Creation/NDArray.flatten.cs

@@ -0,0 +1,16 @@
+using System.Diagnostics.CodeAnalysis;
+
+namespace NumSharp
+{
+    [SuppressMessage("ReSharper", "ParameterHidesMember")]
+    public partial class NDArray
+    {
+        /// <summary>
+        ///     Return a copy of the array collapsed into one dimension.
+        /// </summary>
+        /// <param name="order"></param>
+        /// <returns>A copy of the input array, flattened to one dimension.</returns>
+        /// <remarks>https://docs.scipy.org/doc/numpy/reference/generated/numpy.ndarray.flatten.html</remarks>
+        public NDArray flatten(char order = 'C') => flat.copy(order);
+    }
+}