Add GitHub Project Board to New Feature Proposal Template

Author: TheCodeTraveler

.github/ISSUE_TEMPLATE/open-a-new-feature-proposal.yml

@@ -2,6 +2,7 @@ name: Open a New Feature Proposal
 description: For proposals that have been discussed in the Discussions tab and have been approved by a member of the core .NET MAUI Toolkit team
 title: "[Proposal] "
 labels: [new, proposal]
+projects: ["CommunityToolkit/projects/12"]
 body:
 
 - type: input
@@ -109,4 +110,4 @@ body:
 
 - type: markdown
   attributes:
-    value: Thanks for taking the time to fill out this feature proposal.
+    value: Thanks for taking the time to fill out this feature proposal.