Merge test changes from @martindevans

The poc of the test is working know. Finally the problem error seems to be related with the process stopping.
Once I changed the context with today llama.cpp binaries is working OK

.gitignore

@@ -342,3 +342,4 @@ test/TensorFlowNET.Examples/mnist
 
 # docs
 site/
+*.bin

LLama.Unittest/BasicTest.cs

@@ -1,11 +1,15 @@
+using LLama;
+using LLama.Common;
+
 namespace LLama.Unittest
 {
     public class BasicTest
     {
         [Fact]
-        public void SimpleQA()
+        public void LoadModel()
         {
-            
+            var model = new LLamaModel(new ModelParams("Models/llama-2-7b-chat.ggmlv3.q3_K_S.bin", contextSize: 256));
+            model.Dispose();
         }
     }
 }

LLama.Unittest/LLama.Unittest.csproj

@@ -27,4 +27,19 @@
     <ProjectReference Include="..\LLama\LLamaSharp.csproj" />
   </ItemGroup>
 
+    <Target Name="DownloadContentFiles" BeforeTargets="Build">
+      <DownloadFile SourceUrl="https://huggingface.co/TheBloke/Llama-2-7B-Chat-GGML/resolve/main/llama-2-7b-chat.ggmlv3.q3_K_S.bin" DestinationFolder="Models" DestinationFileName="llama-2-7b-chat.ggmlv3.q3_K_S.bin" SkipUnchangedFiles="true">
+    </DownloadFile>
+  </Target>
+
+
+  <ItemGroup>
+    <Folder Include="Models\" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <None Update="Models\llama-2-7b-chat.ggmlv3.q3_K_S.bin">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </None>
+  </ItemGroup>
 </Project>