Fix the .gitignore

Author: jonburchel

.gitignore

@@ -0,0 +1,25 @@
+# Operating System files
+.DS_Store
+Thumbs.db
+
+log/
+obj/
+_site/
+.optemp/
+_themes*/
+_repo.*/
+
+.openpublishing.buildcore.ps1
+
+.vscode/
+
+*sec.endpointdlp
+
+# CoPilot instructions and prompts
+.github/copilot-instructions.md
+.github/prompts/*.md
+.github/prompts/*.zip
+.github/patterns/*.md
+
+articles/ai-foundry/includes/get-started-fdp.md
+articles/ai-foundry/toc-files/setup-management/toc.yml