Update README.md

Author: Raveler

README.md

@@ -20,6 +20,10 @@ Currently, only a Windows environment with Visual Studio is supported. This is s
 
 There are multiple demo projects included in the solution. Check out the demo-project for a thorough exploration of the features (demuxing, decoding, filtering, encoding, muxing) or one of the other examples for a simpler example to follow.
 
+There is also a .NET Core compatible simplified interface included so that you can embed this project in your .NET Core projects.
+
+## C++
+
 To give you an idea, this code will load a video stream from a container, filter it, and write it back out to another container:
 
 ```C++
@@ -56,6 +60,90 @@ muxer->Close();
 
 ```
 
+If you use the included simple-interface library, which only supports a subset of the full library, using ffmpeg-cpp becomes even easier:
+
+```
+#include "SimpleInterface.h"
+
+int main()
+{
+	void* handle = ffmpegCppCreate("out.mp4");
+	ffmpegCppAddVideoStream(handle, "samples/big_buck_bunny.mp4");
+	ffmpegCppAddVideoFilter(handle, "transpose=cclock[middle];[middle]vignette");
+	ffmpegCppAddAudioStream(handle, "samples/big_buck_bunny.mp4");
+	ffmpegCppGenerate(handle);
+	ffmpegCppClose(handle);
+}
+´´´
+
+## C#
+
+The simple-interface is made in such a way that it can easily be called using [DllImport] from any C# project:
+
+```
+	public class Example
+	{
+
+		public Example()
+		{
+			try
+			{
+				string inFileName = "in.mp4";
+				string outFileName = "out.mp4";
+				IntPtr handle = ffmpegCppCreate(outFileName); CheckError(handle);
+				ffmpegCppAddVideoStream(handle, inFileName); CheckError(handle);
+				ffmpegCppAddAudioStream(handle, inFileName); CheckError(handle);
+				ffmpegCppAddVideoFilter(handle, "crop=1080:1920:740:0[middle];[middle]transpose=3"); CheckError(handle);
+				ffmpegCppGenerate(handle); CheckError(handle);
+				ffmpegCppClose(handle);
+			}
+			catch (InvalidOperationException e)
+			{
+				Console.WriteLine("ERROR: " + e.Message);
+			}
+		}
+
+		private void CheckError(IntPtr handle)
+		{
+			if (ffmpegCppIsError(handle))
+			{
+				IntPtr errorPtr = ffmpegCppGetError(handle);
+				string error = Marshal.PtrToStringAnsi(errorPtr);
+				throw new InvalidOperationException(error);
+			}
+		}
+
+		[DllImport("simple_interface.dll", CallingConvention = CallingConvention.Cdecl)]
+		private static extern IntPtr ffmpegCppCreate(string outFileName);
+
+		[DllImport("simple_interface.dll", CallingConvention = CallingConvention.Cdecl)]
+		private static extern void ffmpegCppAddVideoStream(IntPtr handle, [MarshalAs(UnmanagedType.LPStr)] string inFileName);
+
+		[DllImport("simple_interface.dll", CallingConvention = CallingConvention.Cdecl)]
+		private static extern void ffmpegCppAddAudioStream(IntPtr handle, [MarshalAs(UnmanagedType.LPStr)] string inFileName);
+
+		[DllImport("simple_interface.dll", CallingConvention = CallingConvention.Cdecl)]
+		private static extern void ffmpegCppAddVideoFilter(IntPtr handle, [MarshalAs(UnmanagedType.LPStr)] string filterString);
+
+		[DllImport("simple_interface.dll", CallingConvention = CallingConvention.Cdecl)]
+		private static extern void ffmpegCppAddAudioFilter(IntPtr handle, [MarshalAs(UnmanagedType.LPStr)] string filterString);
+
+		[DllImport("simple_interface.dll", CallingConvention = CallingConvention.Cdecl)]
+		private static extern void ffmpegCppGenerate(IntPtr handle);
+
+		[DllImport("simple_interface.dll", CallingConvention = CallingConvention.Cdecl)]
+		private static extern bool ffmpegCppIsError(IntPtr handle);
+
+		[DllImport("simple_interface.dll", CallingConvention = CallingConvention.Cdecl)]
+		private static extern IntPtr ffmpegCppGetError(IntPtr handle);
+
+		[DllImport("simple_interface.dll", CallingConvention = CallingConvention.Cdecl)]
+		private static extern void ffmpegCppClose(IntPtr handle);
+	}
+´´´
+
+If you want to use ffmpeg-cpp in a C# project, you can easily do so by making your own C-wrapper around the 
+
 # Why?
 
 I developed this project to be able to to integrate FFmpeg into our program without having to call the executable to do an operation. This is important because starting up an external executable tends to be blocked by antivirus software and can cause issues with users. It has been tested for the most common functionality, and some of the examples from https://github.com/FFmpeg/FFmpeg/tree/master/doc/examples are mirrored in the project as well.