Added CODEOWNERS and .gitignore files

.github/CODEOWNERS

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+* @microsoft/agent365-approvers

.gitignore

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+## A streamlined .gitignore for modern .NET projects
+## including temporary files, build results, and
+## files generated by popular .NET tools. If you are
+## developing with Visual Studio, the VS .gitignore
+## https://github.com/github/gitignore/blob/main/VisualStudio.gitignore
+## has more thorough IDE-specific entries.
+##
+## Get latest from https://github.com/github/gitignore/blob/main/Dotnet.gitignore
+
+# Build results
+[Dd]ebug/
+[Dd]ebugPublic/
+[Rr]elease/
+[Rr]eleases/
+x64/
+x86/
+[Ww][Ii][Nn]32/
+[Aa][Rr][Mm]/
+[Aa][Rr][Mm]64/
+bld/
+[Bb]in/
+[Oo]bj/
+[Ll]og/
+[Ll]ogs/
+
+# Locally built Nuget package cache file
+.lastbuild
+
+# .NET Core
+project.lock.json
+project.fragment.lock.json
+artifacts/
+
+# ASP.NET Scaffolding
+ScaffoldingReadMe.txt
+
+# NuGet Packages
+*.nupkg
+# NuGet Symbol Packages
+*.snupkg
+
+# Others
+~$*
+*~
+CodeCoverage/
+
+# MSBuild Binary and Structured Log
+*.
+*.log
+
+# MSTest test Results
+[Tt]est[Rr]esult*/
+[Bb]uild[Ll]og.*
+
+# Visual Studio
+.vs/
+
+# NUnit
+*.VisualState.xml
+TestResult.xml
+nunit-*.xml
+
+# Python build artifacts
+*.egg-info/
+__pycache__/
+*.py[cod]
+*$py.class
+*.pyc
+*.pyo
+*.pyd
+dist/
+build/
+.eggs/
+.pytest_cache/
+_version.py
+
+# Virtual environments
+.venv/
+venv/
+env/
+.env
+.env/
+*.env
+
+# JavaScript/Node.js build artifacts
+node_modules/
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+package-lock.json.bak
+.cache/
+.next/
+out/
+coverage/
+
+# We should have at some point .vscode, but for not ignore since we don't have standard
+.vscode
+.claude/
+**/.claude/
+.idea/
+
+# OS-specific files
+.DS_Store
+Thumbs.db