ignores and project file.

.gitignore

@@ -39,3 +39,7 @@ Thumbs.db
 
 # dotCover
 *.dotCover
+
+src/Avalonia\.Native\.OSX/Avalonia\.Native\.OSX\.xcodeproj/project\.xcworkspace/xcshareddata/IDEWorkspaceChecks\.plist
+
+src/Avalonia\.Native\.OSX/Avalonia\.Native\.OSX\.xcodeproj/project\.xcworkspace/xcshareddata/WorkspaceSettings\.xcsettings

src/Avalonia.Native.OSX/Avalonia.Native.OSX.xcodeproj/project.pbxproj

@@ -14,6 +14,7 @@
 /* End PBXBuildFile section */
 
 /* Begin PBXFileReference section */
+		379A4506214D0F6500CC143D /* headers */ = {isa = PBXFileReference; lastKnownFileType = folder; name = headers; path = ../headers; sourceTree = "<group>"; };
 		AB00E4F62147CA920032A60A /* main.mm */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.objcpp; path = main.mm; sourceTree = "<group>"; };
 		AB661C1D2148230F00291242 /* AppKit.framework */ = {isa = PBXFileReference; lastKnownFileType = wrapper.framework; name = AppKit.framework; path = System/Library/Frameworks/AppKit.framework; sourceTree = SDKROOT; };
 		AB661C1F2148286E00291242 /* window.mm */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.objcpp; path = window.mm; sourceTree = "<group>"; };
@@ -45,6 +46,7 @@
 		AB7A61E62147C814003C5833 = {
 			isa = PBXGroup;
 			children = (
+				379A4506214D0F6500CC143D /* headers */,
 				AB8F7D6A21482D7F0057DBA5 /* platformthreading.mm */,
 				AB661C212148288600291242 /* common.h */,
 				AB661C1F2148286E00291242 /* window.mm */,