Adds agent guidelines and funding file

Adds guidelines for AI agents assisting with code contributions, emphasizing code quality, testing, and security.

Introduces a funding file to support project development.

Author: niemyjski

.github/FUNDING.yml

@@ -0,0 +1 @@
+github: exceptionless

.github/copilot-instructions.md

@@ -0,0 +1,26 @@
+name: "Copilot Setup"
+
+on:
+  workflow_dispatch:
+  push:
+    paths:
+      - .github/workflows/copilot-setup-steps.yml
+  pull_request:
+    paths:
+      - .github/workflows/copilot-setup-steps.yml
+
+jobs:
+  copilot-setup-steps:
+    runs-on: ubuntu-latest
+
+    permissions:
+      contents: read
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v6
+
+      - name: Setup .NET Core
+        uses: actions/setup-dotnet@v5
+        with:
+          dotnet-version: 10.0.x