Update README.md

Add a list of supported platforms.

Author: zwcloud

README.md

@@ -1,6 +1,51 @@
 # CairoSharp
 A C# wrapper of cairo. All its dependcies included.
 
+Cairo is a 2D graphics library with support for multiple output devices. Currently supported output targets include the X Window System (via both Xlib and XCB), Win32, image buffers.
+
+# Platforms
+Cairo only works on desktop platforms, and so does CarioSharp.
+
+* Desktop
+  - Windows
+  
+    Platform                        | Supported 
+    --------------------------------|-----------
+    Console Application             | Yes       
+    Winform                         | Yes       
+    WPF                             | Yes       
+    Universal Windows Platform (UWP)| No        
+
+  - Linux
+  
+    Yes (tested for an older version).
+
+  - macOS
+  
+    Unknown, not tested. The former Mono.Cairo should work on macOS, so it is very likely that CairoSharp also works.
+  
+* Mobile
+  - Windows
+  
+    Platform                        | Supported 
+    --------------------------------|-----------
+    Windows Phone 8.1               | No         
+    Universal Windows Platform (UWP)| No        
+
+  - iOS
+  
+    Unknown, not tested.
+  
+  - Android
+  
+    Unknown, not tested.
+
+  __Note__
+  Cairo won't compile on UWP or Windows Phone platforms. Because cairo(native) and its dependencies use some c runtime functions and Win32 APIs that are incompatible with the Windows Runtime apps, such as [GradientFill](https://msdn.microsoft.com/en-us/library/dd144957.aspx), which is desktop apps only.
+
+  __Note__
+  The cairo-gl backend won't compile on all windows platforms: [`wglGetProcAddress` issue (2016 October)](https://lists.cairographics.org/archives/cairo/2016-October/027774.html), [`wglGetProcAddress` issue (2013 April)](https://lists.cairographics.org/archives/cairo/2013-April/024201.html)
+
 # [Documentation](https://github.com/zwcloud/CairoSharp/wiki)
 
 # Copying/License
@@ -23,17 +68,17 @@ Project Cairo(not the native cairo lib but the C# one) is licensed under the LGP
     You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-The C# code files in Cairo project is orginally Taken from Mono/[GTK#](https://github.com/mono/gtk-sharp/tree/master/cairo)(Version 3.0.0), licensed under the GNU LGPL. Copying info:
+The C# code files in Cairo project was taken from Mono/[GTK#](https://github.com/mono/gtk-sharp/tree/master/cairo)(Version 3.0.0), licensed under the GNU LGPL. Copying info:
 
     Copyright (C) 2007-2015  Xamarin, Inc.
     Copyright (C) 2006 Alp Toker
     Copyright (C) 2005 John Luke
     Copyright (C) 2004 Novell, Inc (http://www.novell.com)
     Copyright (C) Ximian, Inc. 2003
 
-The [Native project files](https://github.com/zwcloud/CairoSharp/tree/master/Native/projects) is generated according to a VS2015 Solution from [Cairo-VS](https://github.com/DomAmato/Cairo-VS).
+## Native libraries
 
-**About other native libraries:**
+The [Native project files](https://github.com/zwcloud/CairoSharp/tree/master/Native/projects) is generated according to a VS2015 Solution from [Cairo-VS](https://github.com/DomAmato/Cairo-VS).
 
 * [cairo](http://www.cairographics.org/)
   Version 1.15.2