Update README

Author: tcmorris

.github/README.md

@@ -8,13 +8,7 @@ A community package from the [Umbraco sustainability team](https://umbraco.com/b
 
 In the backoffice, there is a content app to see page weight and carbon emissions, which is then converted to a carbon rating for individual pages.
 
-<!--
-Including screenshots is a really good idea! 
-
-If you put images into /docs/screenshots, then you would reference them in this readme as, for example:
-
-<img alt="..." src="https://github.com/rickbutterfield/Umbraco.Community.Sustainability/blob/develop/docs/screenshots/screenshot.png">
--->
+<img src="https://raw.githubusercontent.com/rickbutterfield/Umbraco.Community.Sustainability/main/.github/assets/sustainability-contentapp-2.jpeg" alt="Umbraco.Community.Sustainability content app" />
 
 ## Installation
 

src/Umbraco.Community.Sustainability.sln

@@ -5,6 +5,7 @@ VisualStudioVersion = 17.4.33020.496
 MinimumVisualStudioVersion = 10.0.40219.1
 Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Solution Items", "Solution Items", "{F2202CE0-0485-4493-A256-F2E7B2DCB32D}"
 	ProjectSection(SolutionItems) = preProject
+		..\.github\CONTRIBUTING.md = ..\.github\CONTRIBUTING.md
 		..\LICENSE = ..\LICENSE
 		..\.github\README.md = ..\.github\README.md
 		..\umbraco-marketplace.json = ..\umbraco-marketplace.json