Lesson 1 with .net .gitignore and clean repo

.gitignore

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+## -----------------------------
+## .NET build artifacts
+## -----------------------------
+
+# Build output
+bin/
+obj/
+
+# Publish output
+*.publish/
+publish/
+
+# NuGet packages
+*.nupkg
+*.snupkg
+packages/
+
+# For local NuGet sources
+*.nuspec
+
+## -----------------------------
+## IDE / Editor Specific
+## -----------------------------
+
+# Visual Studio (Windows)
+.vs/
+
+# Rider (JetBrains)
+.idea/
+*.sln.iml
+
+# VS Code
+.vscode/
+*.code-workspace
+
+# OmniSharp & Roslyn temp cache
+.omnisharp/
+.vscode-test/
+
+## -----------------------------
+## OS-specific junk
+## -----------------------------
+
+# Windows Explorer
+Thumbs.db
+Desktop.ini
+
+# macOS Finder
+.DS_Store
+
+# Linux temp files
+*~
+
+## -----------------------------
+## Logs / Temp / Runtime
+## -----------------------------
+
+# Logs
+*.log
+
+# DotNet watcher temp
+.dotnet/
+
+# User-specific config/generated files
+*.user
+*.userosscache
+*.suo
+
+# Auto-generated by Visual Studio
+*.cache/
+*.pdb
+*.mdb
+
+## -----------------------------
+## Test / Coverage tools
+## -----------------------------
+
+# Coverlet
+coverage.json
+coverage.opencover.xml
+coverage.cobertura.xml
+
+# Test results
+TestResults/
+*.trx
+
+# NCrunch
+_NCrunch_*
+*ncrunchsolution*
+
+## -----------------------------
+## Build system artifacts
+## -----------------------------
+
+# MSBuild artifacts
+*.obj
+*.cache
+*.tlog
+
+# Rider MSBuild artifacts
+riderModule.iml
+
+## -----------------------------
+## Secret or runtime config
+## -----------------------------
+
+# DO NOT COMMIT real secrets automatically
+# (user credentials, API keys, etc)
+secrets.json
+
+# Local environment files
+.env
+.env.*.local
+
+## -----------------------------
+## Misc things we also don't want
+## -----------------------------
+
+# Local tools
+tools/
+
+# Artifacts folders
+artifacts/
+dist/
+out/
+
+# Crash dumps
+*.dmp
+*.stackdump
+
+# Package restore metadata
+project.lock.json
+project.fragment.lock.json