Add README for EncodingAndPackagingExample

EncodingAndPackagingExample/README.md

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+Encoding and Packaging Samples
+==
+
+This folder contains sample code about how to encode an MP4 video file into multiple resolution streams and pacakge these streams
+to DASH format which is suitable for playback in browser.
+
+There are three projects: 
+
+* `EncodingAndPackagingTool.Core` contains the code of core functionality.
+* `EncodingAndPackagingTool.Cli` contains a standalone command line executable application which will invoke `EncodingAndPackagingTool.Core`.
+* `EncodingAndPackagingTool.AzureFunction` contains an Azure Function which can be triggered by a message from azure message queue.
+
+In order to run these samples, user need install [FFmpeg](https://ffmpeg.org/download.html) on the machine. Please follow info in this
+[link](https://ffmpeg.org/download.html) to install FFmpeg on yours system and add it to the path of your system.
+
+Some installation examples:
+
+- For Ubuntu, you can use the package manager 'apt' which will install and add ffmpeg to your path.
+
+    ```
+    sudo apt install -y ffmpeg
+    ```
+
+- For Windows 11, you can use 'winget' to install from [gyan.dev](https://www.gyan.dev/ffmpeg/builds/) which will install and add ffmpeg to your path (Note that for windows, after you install, you need to recycle the command prompt windows to get the updated PATH.)
+
+    ```
+    winget install ffmpeg
+    ```
+
+These samples also Azure Identity library for authentication.
+See [here](https://learn.microsoft.com/en-us/dotnet/api/overview/azure/identity-readme?view=azure-dotnet) for various ways to authenticate and the settings needed.
+
+You'll need to have the following permissions:
+
+- The identity must have `Reader` role on the MP4 file input container blob.
+- The identity must have `Contributor` role on the output container.
+
+If you want to deploy `EncodingAndPackagingTool.AzureFunction` sample in an Azure Function, please following info in this [link](https://learn.microsoft.com/en-us/azure/azure-functions/functions-how-to-custom-container?tabs=core-tools%2Cacr%2Cazure-cli&pivots=azure-functions).