Add dependency (macOS) on OpenCv

TODO.txt

@@ -1,3 +1,21 @@
+-Add ImageMagick attribution to about page
+-auto detect receipts in an image and auto-crop?
+    -https://imagemagick.org/api/feature.php#gsc.tab=0 canny edge image
+    -https://blog.jiayu.co/2019/05/edge-detection-with-imagemagick/
+    -https://pyimagesearch.com/2021/10/27/automatically-ocring-receipts-and-scans/ using open CV
+    -https://www.kaggle.com/code/dmitryyemelyanov/receipt-ocr-part-1-image-segmentation-by-opencv manip done before edge detect
+    -https://www.luisllamas.es/en/how-to-use-opencv-in-net-with-opencvsharp/ (some basic code but also line detect)
+    -opencv for macOS? https://www.nuget.org/packages/OpenCvSharp4.runtime.osx.10.15-universal
+        macOS arm64: https://www.nuget.org/packages/OpenCvSharp4.runtime.osx_arm64/4.8.1-rc
+        -can use the normal nuget for windows, linnux
+        -if we can get openCV working then we can probably hack something together...
+        -https://github.com/shimat/opencvsharp/issues/949 -- requires ffmpeg?!
+        -https://github.com/shimat/opencvsharp
+    -https://www.emgu.com/wiki/index.php?title=Main_Page (GPL...)
+    -https://stackoverflow.com/questions/30296710/detecting-paper-edge-and-crop-it
+
+
+---------------
 *-add more items
 *-save last opened folder to settings somewhere
 
@@ -21,4 +39,5 @@
 ---Publishing---
 *-Published app has unneeded .DSYM file (fixed via .app builder)
 *-Published app has Assets folder already copied to it; don't want that in output macOS folder but it's being copied there anyway (fixed via .app builder)
-*-macOS x64 build
+*-macOS x64 build
+

src/MayShow.csproj

@@ -52,4 +52,7 @@
     <PackageReference Include="DialogHost.Avalonia" Version="0.10.4" />
     <PackageReference Include="Xaml.Behaviors.Interactions.DragAndDrop.DataGrid" Version="11.3.9.5" />
   </ItemGroup>
+  <ItemGroup Condition=" '$([System.Runtime.InteropServices.RuntimeInformation]::IsOSPlatform($([System.Runtime.InteropServices.OSPlatform]::OSX)))'  ">
+    <PackageReference Include="OpenCvSharp4.runtime.osx.10.15-universal" Version="4.7.0.20230224" />
+  </ItemGroup>
 </Project>