First of all, thank you for thinking of contributing to this project 😄
Before sending a Pull Request, consider making an issue in the repository and assigning it to yourself.
You need to clone the repository and restore packages. Navigate to the src/ElectricityMap.DotNet.Client folder and run the following command.
dotnet restore
After the packages have been restored, you can run the application.
dotnet run
Make sure to have sufficient test coverage for all contributed work.