Added prebuild placeholder script

prebuild.sh

+#!/bin/sh
+
+echo "Ahoy!"

test-sql-provider.fsproj

@@ -6,8 +6,12 @@
     <RootNamespace>test_sql_provider</RootNamespace>
   </PropertyGroup>
 
+  <Target Name="TypeProviderSetup" BeforeTargets="Build">
+    <Exec Command="./prebuild.sh"/>
+  </Target>
+
   <ItemGroup>
     <Compile Include="Program.fs" />
   </ItemGroup>
 
-</Project>
+</Project>
\ No newline at end of file