The easiest way of getting set up is to install as a Dotnet tool.
To install the tool globally:
dotnet tool install -g monobuild
This allows you to use the tool on the command line by simply typing monobuild. More information on the installation and removal of Dotnet tools is available here
A local installation limits the tool to a particular directory.
The advantage of this is that if the directory is a Git repository that means that the tool configuration will travel with the repository. Other members of the team (or the CI/CD process) can get access to all the tools installed in a repository by running dotnet tool restore more information on this is available here.
The disadvantage of this, is that you need to type dotnet monobuild to execute the tool.
If you have not installed any Dotnet tools into your current directory, you will need create a manifest with:
dotnet new tool-manifest
Once the manifest is in place, local installation is as simple as:
dotnet tool install monobuild