Create a Google Apps Script Menu

onOpen

function onOpen() {
   
  var ss = SpreadsheetApp.getActiveSpreadsheet();
   var menuEntries = [];

   menuEntries.push({name: "Function Label", functionName: "doGet"});
   menuEntries.push(null); // line separator
   menuEntries.push({name: "Function Label", functionName: "doGet"});

   ss.addMenu("Github", menuEntries);
}