dotnet-add-{package, reference}: add page (#11024)

* Add dotnet add *

* Update pages/common/dotnet-add-package.md

Co-authored-by: Lena <126529524+acuteenvy@users.noreply.github.com>

* Update pages/common/dotnet-add-package.md

Co-authored-by: Lena <126529524+acuteenvy@users.noreply.github.com>

* Update pages/common/dotnet-add-reference.md

Co-authored-by: Lena <126529524+acuteenvy@users.noreply.github.com>

---------

Co-authored-by: Lena <126529524+acuteenvy@users.noreply.github.com>

pages/common/dotnet-add-package.md

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+# dotnet add package
+
+> Add or update a .NET package reference in a project file.
+> More information: <https://learn.microsoft.com/dotnet/core/tools/dotnet-add-package>.
+
+- Add a package to the project in the current directory:
+
+`dotnet add package {{package}}`
+
+- Add a package to a specific project:
+
+`dotnet add {{path/to/file.csproj}} package {{package}}`
+
+- Add a specific version of a package to the project:
+
+`dotnet add package {{package}} --version {{1.0.0}}`
+
+- Add a package using a specific NuGet source:
+
+`dotnet add package {{package}} --source {{https://api.nuget.org/v3/index.json}}`
+
+- Add a package only when targeting a specific framework:
+
+`dotnet add package {{package}} --framework {{net7.0}}`
+
+- Add and specify the directory where to restore packages (`~/.nuget/packages` by default):
+
+`dotnet add package {{package}} --package-directory {{path/to/directory}}`

pages/common/dotnet-add-reference.md

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+# dotnet add reference
+
+> Add .NET project-to-project references.
+> More information: <https://learn.microsoft.com/dotnet/core/tools/dotnet-add-reference>.
+
+- Add a reference to the project in the current directory:
+
+`dotnet add reference {{path/to/reference.csproj}}`
+
+- Add a reference to the specific project:
+
+`dotnet add {{path/to/project.csproj}} reference {{path/to/reference.csproj}}`