Add prompt for creating pull requests for .NET 10 Preview 7

Author: jamesmontemagno

.github/prompts/createprs-for-preview.prompt.md

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+---
+mode: agent
+---
+
+
+Go through each folder in release-notes/10.0/preview7 and one at a time i want you do to the following:
+
+1. create a new branch names **dotnet10-p7-<name>** where <name> is the name of the file without the extension.
+2. modify the file in some simple way by adding a new line at the end of the file with the text "Something about the feature" in it.
+3. commit the change with the message "Update <name> for preview 7" where <name> is the name of the file without the extension.
+4. push the branch to the remote repository.
+5. create a pull request with the title "Update <name> for preview 7" and the body "Please update the release notes here as needed for Preview 7.\n\n/cc @<reviewer>" where <name> is the name of the file without the extension and <reviewer> is assigned based on the assignment table below.
+6. go back to the dotnet10-p7 branch and repeat the process for the next file.
+
+## Assignment Table (based on Preview 6 patterns):
+
+| File | Assignee(s) | Based on Preview 6 PR |
+|------|-------------|----------------------|
+| aspnetcore.md | @danroth27 | #9953 |
+| containers.md | @lbussell | #9942 |
+| csharp.md | @BillWagner | #9943 |
+| dotnetmaui.md | @davidortinau | #10013 |
+| efcore.md | @roji | #9945 |
+| fsharp.md | @T-Gro | #9946 |
+| libraries.md | @richlander @tarekgh | #9952 |
+| runtime.md | @ericstj @kunalspathak | #9951 |
+| sdk.md | @baronfel @mariam-abdulla @nohwnd | #9949 |
+| visualbasic.md | @BillWagner | #9950 |
+| winforms.md | @merriemcgaw | #9947 |
+| wpf.md | @harshit7962 | #9948 |
+
+Here are the files you need to do this one at a time for:
+- aspnetcore.md
+- containers.md
+- csharp.md
+- dotnetmaui.md
+- efcore.md
+- fsharp.md
+- libraries.md
+- runtime.md
+- sdk.md
+- visualbasic.md
+- winforms.md
+- wpf.md