Added packaging and push for core (#124)

Author: Ellerbach

azure-pipelines.yml

@@ -64,6 +64,10 @@ jobs:
     parameters:
       nugetPackageName: 'nanoFramework.Graphics'
 
+  - template: azure-pipelines-templates/class-lib-package.yml@templates  
+    parameters:
+      nugetPackageName: 'nanoFramework.Graphics.Core'
+
   - template: azure-pipelines-templates/class-lib-package.yml@templates  
     parameters:
       nugetPackageName: 'nanoFramework.Graphics.Gc9A01'

nanoFramework.Graphics.sln

@@ -12,6 +12,7 @@ Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Solution Items", "Solution
 		nanoFramework.Graphics.Ili9341.nuspec = nanoFramework.Graphics.Ili9341.nuspec
 		nanoFramework.Graphics.Ili9342.nuspec = nanoFramework.Graphics.Ili9342.nuspec
 		nanoFramework.Graphics.nuspec = nanoFramework.Graphics.nuspec
+		nanoFramework.Graphics.Core.nuspec = nanoFramework.Graphics.Core.nuspec
 		nanoFramework.Graphics.Otm8009A.nuspec = nanoFramework.Graphics.Otm8009A.nuspec
 		nanoFramework.Graphics.Ssd1306.nuspec = nanoFramework.Graphics.Ssd1306.nuspec
 		nanoFramework.Graphics.Ssd1331.nuspec = nanoFramework.Graphics.Ssd1331.nuspec