Within ~/Namster/src/Namster, run:

dotnet restore
dotnet build
dotnet run

This requires that .NET Core be installed.

Occasionally (and definitely before first run) you'll need to update the dependencies and download new libraries. Run these commands in ~/Namster/src/Namster:

npm install
bower install
gulp build

There is a bug with the Mac mono runtime that may cause an error running the web server. If you get the error: IOException: kqueue() FileSystemWatcher has reached the maximum nunmber of files to watch. then you'll need to add the following line to the top of your ~/.bash_profile file and restart your terminal.

export MONO_MANAGED_WATCHER=false

Follow the instructions at Install for Mac OS X 10.11.

OR

I like to install via command line:

Install .Net Core

brew cask install dotnet

And you're good to go!