Create README.md

Author: danielgerlag

src/providers/WorkflowCore.Persistence.SqlServer/README.md

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+# SQL Server Persistence provider for Workflow Core
+
+Provides support to persist workflows running on [Workflow Core](../../README.md) to a SQL Server database.
+
+## Installing
+
+Install the NuGet package "WorkflowCore.Persistence.SqlServer"
+
+```
+PM> Install-Package WorkflowCore.Persistence.SqlServer -Pre
+```
+
+## Usage
+
+Use the .UseSqlServer extension method when building your service provider.
+
+```C#
+services.AddWorkflow(x => x.UseSqlServer(@"Server=.;Database=WorkflowCore;Trusted_Connection=True;", true, true));
+```