Add doc on asset licensing model (dotnet#110418)

docs/project/licensing-assets.md

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+# .NET Asset Licensing Model
+
+> The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+
+The [MIT](https://github.com/dotnet/core/blob/main/LICENSE.TXT) license and others like it have a provision that distributions of software should include the license. This is the model we should be following.
+
+Each .NET binary distribution must carry:
+
+- Its license
+- Third party notice
+
+Binary distributions include: compressed archives, runtime packs, installers, container images, packages, and anything else where we deliver "substantial portions of the Software".
+
+Note: Distributions must contain and display the correct license. For example, the [Microsoft.NETCore.App.Runtime.win-x64](https://www.nuget.org/packages/Microsoft.NETCore.App.Runtime.win-x64/) runtime pack must contain the correct license and the correct license metadata, displayed in the NuGet gallery. Installers have a similar model with license UI.
+
+## Product distributions
+
+For product distributions, the following licenses should be used.
+
+- On Linux and macOS, the license should be the [.NET MIT license](https://github.com/dotnet/core/blob/main/LICENSE.TXT).
+- On Windows, the license should be the [.NET Library License](https://dotnet.microsoft.com/dotnet_library_license.htm) per [Windows license information](https://github.com/dotnet/core/blob/main/license-information-windows.md).
+
+Product distributions include [downloadable assets](https://dotnet.microsoft.com/en-us/download/dotnet/8.0) and NuGet runtime packs.
+
+## Package distributions
+
+Library packages, like [System.Text.Json](https://www.nuget.org/packages/System.Text.Json), should use the .NET MIT license.
+
+"Packages" do not include runtime packs.