Merge pull request #438 from microsoft/user/numform/batching-readme

Add Batching README

Author: nums11

Samples/WinMLSamplesGallery/WinMLSamplesGallery/Samples/Batching/README.md

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+# WinML Samples Gallery: Batching
+ Perform infererence over multiple inputs at once to increase runtime performance.
+ 
+ Use this sample to compare inference runtime performace with and without batched inputs. 50 images will be passed through SqueezeNet for classification. Set a batch size and click Start Inference to compare.
+ 
+<img src="docs/BatchingScreenshot.png" width="650"/>
+
+- [Getting Started](#getting-started)
+- [BatchSizeOverride](#batchsizeoverride)
+- [Feedback](#feedback)
+- [External Links](#external-links)
+
+## Getting Started
+- Check out the [source](https://github.com/microsoft/Windows-Machine-Learning/blob/master/Samples/WinMLSamplesGallery/WinMLSamplesGallery/Samples/Batching/Batching.xaml.cs).
+- Learn how to [add the BatchSizeOverride property](https://github.com/microsoft/Windows-Machine-Learning/blob/master/Samples/WinMLSamplesGallery/WinMLSamplesGallery/Samples/Batching/Batching.xaml.cs#L125) to your session.
+- Learn how to [evaluate batched input](https://github.com/microsoft/Windows-Machine-Learning/blob/master/Samples/WinMLSamplesGallery/WinMLSamplesGallery/Samples/Batching/Batching.xaml.cs#L186).
+
+## BatchSizeOverride
+- Learn more about the BatchSizeOverride property from the [docs](https://docs.microsoft.com/en-us/uwp/api/windows.ai.machinelearning.learningmodelsessionoptions.batchsizeoverride?view=winrt-22000).
+- **Note**: To use batched inputs, the model must have a value of -1 or a variable name in the input batch dimension. Additionally, the DATA_BATCH Denotation must be added on the batch dimension. To edit your model you can use tools like [WinML Dashboard](https://github.com/Microsoft/Windows-Machine-Learning/tree/master/Tools/WinMLDashboard).
+
+## Feedback
+Please file an issue [here](https://github.com/microsoft/Windows-Machine-Learning/issues/new) if you encounter any issues with the WinML Samples Gallery or wish to request a new sample.
+
+## External Links
+
+- [Windows ML Library (WinML)](https://docs.microsoft.com/en-us/windows/ai/windows-ml/)
+- [DirectML](https://github.com/microsoft/directml)
+- [ONNX Model Zoo](https://github.com/onnx/models)
+- [Windows UI Library (WinUI)](https://docs.microsoft.com/en-us/windows/apps/winui/)