added build instructions

Author: kopaka1822

Docs/README.md

@@ -33,6 +33,10 @@ Version 2.1 x64 Windows: [Download](https://github.com/kopaka1822/ImageViewer/ra
 
 [Used Libraries](about.md)
 
+## Build
+
+If you want to build and debug the Image Viewer, follow the instructions [here](build.md).
+
 ## Features 
 
 * quick [side-by-side comparison](#Side-By-Side-Comparision-and-Image-Manipulation)

Docs/build.md

@@ -0,0 +1,17 @@
+# Build instructions
+
+Requirements:
+- Windows x64
+- Visual Studio 2019 (with C++, C# and NuGet Package Manager)
+- .NET Framework 4.6.1
+
+Instructions:
+
+1. Do a recursive pull (this project uses submodules)
+2. Open the TextureViewer.sln with Visual Studio
+3. In the Solution Explorer, select ImageViewer as startup project
+4. Switch architecture from "Any Cpu" to "x64" (and Debug to Release for release builds).
+5. Build the solution (This should also download the required packages via NuGet)
+
+Debug:
+In order to debug the .dll files (namely DxImageLoader.dll) go to the Solution Explorer. Right Click on the ImageViewer Projects and go to Properties->Debug. Select "Enable native code debugging"