Add README for samples and Microphone Stream

Author: Swimburger

Samples/MicrophoneStream/README.md

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+# Transcribe audio from the microphone in real-time
+
+The following things are required to run the sample:
+* [.NET 8 or up](https://dotnet.microsoft.com/en-us/download)
+* [Install SoX and add it to the PATH environment variable](https://sourceforge.net/projects/sox/)
+* An [AssemblyAI](https://www.assemblyai.com/dashboard/signup) account with credit card set up
+* Configure [your AssemblyAI API key](https://www.assemblyai.com/app/account) using .NET user-secrets:
+  ```bash
+  dotnet user-secrets set AssemblyAI:ApiKey [YOUR_API_KEY]
+  ```
+  
+Now run the sample:
+
+```bash
+dotnet run
+```
+
+Speak into your microphone to see your speech transcribed in real-time.

Samples/README.md

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+# Samples for the AssemblyAI C# .NET SDK
+
+This solution contains a variety of samples that show how to use the AssemblyAI SDK for C# .NET.
+
+* [MicrophoneStream](./MicrophoneStream): A console app to transcribe speech from the microphone in real-time.
+* [Avalonia](./Avalonia): An Avalonia app that lets you transcribe audio files, prompt LLMs using LeMUR, and transcribe speech from the microphone in real-time.
+* [BlazorSample](./BlazorSample): A Blazor WASM and Server app that lets you transcribe audio files, prompt LLMs using LeMUR, and transcribe speech from the microphone in real-time.
+* [TwilioVoice](./TwilioVoice): An ASP.NET Core app that uses Twilio Media Streams to transcribe speech from Twilio Voice calls  in real-time.