Create README.md

Author: johelvisguzman

src/DotNetToolkit.Repository.AzureStorageTable/README.md

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+# How to Use?
+
+```csharp
+var options = new RepositoryOptionsBuilder()
+    .UseAzureStorageTable(...) // for microsoft azure storage table service
+    .Options;
+    
+var repo = new Repository<Customer>(options);
+```