Update "Upgrading Java projects with GitHub Copilot" to summarise Java and .NET upgrades (#56380)

Author: guntrip

content/copilot/tutorials/index.md

@@ -18,7 +18,7 @@ children:
   - /learning-a-new-programming-language-with-github-copilot
   - /modernizing-legacy-code-with-github-copilot
   - /using-copilot-to-migrate-a-project
-  - /upgrading-java-projects-with-github-copilot
+  - /upgrading-projects-with-github-copilot
   - /rolling-out-github-copilot-at-scale
 redirect_from:
   - /copilot/using-github-copilot/guides-on-using-github-copilot

content/copilot/tutorials/upgrading-java-projects-with-github-copilot.md

@@ -0,0 +1,39 @@
+---
+title: Upgrading projects with GitHub Copilot
+shortTitle: Upgrade projects
+intro: 'You can use {% data variables.product.prodname_copilot %} to upgrade your Maven and Gradle Java applications and .NET applications.'
+versions:
+  feature: copilot
+topics:
+  - Copilot
+redirect_from:
+  - /copilot/using-github-copilot/guides-on-using-github-copilot/upgrading-java-projects-with-github-copilot
+  - /copilot/tutorials/upgrading-java-projects-with-github-copilot
+---
+
+> [!NOTE]
+> "GitHub Copilot app modernization – upgrade for Java" and "GitHub Copilot app modernization – Upgrade for .NET" are currently in {% data variables.release-phases.public_preview %} and subject to change.
+
+## Introduction
+
+{% data variables.product.prodname_copilot %} can help streamline the process of modernizing and upgrading your Java and .NET applications. {% data variables.product.prodname_copilot_short %} will analyze the project, generate a plan, automatically fix issues it encounters when carrying out the plan, and produce a summary.
+
+## Upgrading Java projects
+
+You can upgrade a Git-based Maven or Gradle Java project using {% data variables.product.prodname_copilot %} in {% data variables.product.prodname_vscode %}. You will need:
+
+* Either a **{% data variables.copilot.copilot_for_business %}** or **{% data variables.copilot.copilot_enterprise %}** [subscription plan](/copilot/about-github-copilot/subscription-plans-for-github-copilot).
+* The latest version of [{% data variables.product.prodname_vscode %}](https://code.visualstudio.com/).
+* For Maven-based projects, access to the public Maven Central repository.
+* Installed versions of both the source and target JDKs.
+
+For the next steps, see [Quickstart: upgrade a Java project with GitHub Copilot App Modernization - upgrade for Java (preview)](https://learn.microsoft.com/en-gb/java/upgrade/quickstart-upgrade) on Microsoft Learn.
+
+## Upgrading .NET projects
+
+You can also upgrade a .NET project using {% data variables.product.prodname_copilot %} in {% data variables.product.prodname_vs %}. You will need:
+
+* Either a **{% data variables.copilot.copilot_pro %}**, **{% data variables.copilot.copilot_pro_plus %}**, **{% data variables.copilot.copilot_for_business %}** or **{% data variables.copilot.copilot_enterprise %}** [subscription plan](/copilot/about-github-copilot/subscription-plans-for-github-copilot).
+* The latest release of {% data variables.product.prodname_vs %} Enterprise, Professional or Community 2022.
+
+For the next steps, see [GitHub Copilot app modernization - upgrade for .NET](https://marketplace.visualstudio.com/items?itemName=ms-dotnettools.GitHubCopilotUpgradeAgent) on Microsoft Visual Studio Marketplace.