add system.drawing.common to library.

Setup the domain file and stubout first public facing function.

DeathSocket/DeathSocket.fsproj

@@ -6,8 +6,13 @@
 
   <ItemGroup>
     <Content Include="test-img.jpg" />
+    <Compile Include="Domain.fs" />
     <Compile Include="GridPainter.fs" />
     <None Include="ScratchPad.fsx" />
   </ItemGroup>
 
+  <ItemGroup>
+    <PackageReference Include="System.Drawing.Common" Version="4.5.0" />
+  </ItemGroup>
+
 </Project>

DeathSocket/Domain.fs

@@ -0,0 +1,12 @@
+namespace DeathSocket
+
+    module Domain =
+
+        open System.Drawing
+        
+        type ImageSpec =
+            { filePath: string;
+              colour: Brush; 
+              penWidth: float32 
+              rows: int;
+              columns: int }

DeathSocket/GridPainter.fs

@@ -1,5 +1,7 @@
 namespace DeathSocket
 
     module GridPainter =
-        // code to go here...
-        let x = "begin"
+
+        let applyGridToImage spec =
+            //validateFilePath 
+            0

DeathSocket/ScratchPad.fsx

@@ -12,8 +12,7 @@ let img = Bitmap.FromFile (__SOURCE_DIRECTORY__ + "/test-img.jpg")
 let graphics = Graphics.FromImage img
 let imgWidth = img.Size.Width
 let imgHeight = img.Size.Height
-(* Keeping it simple here.
-Going to just create a 2x2 grid.
+(* Keeping it simple here. Going to just create a 2x2 grid.
 In other words, I'm just halving the width and the height. *)
 let verticalLine = 
     let midpoint = imgHeight / 2
@@ -31,5 +30,4 @@ let savePath = desktop + "/test-grid.png" // Change this to suit you.
 img.Save (savePath)
 img.Dispose
 graphics.Dispose
-pen.Dispose
-
+pen.Dispose