title: Set ANDROID_HOME environment variable in mac
body: <p>I am new in developing native app using Salesforce SDK. I tried to create android project from command line using forcedroid tool but there is problem in setting environment variable named ANDROID_HOME.</p>
  
  <p>But i don't know how to set this variable.</p>
  
  <p>I am attaching screenshot to describe my problem correctly.</p>
  
  <p><img src="https://i.stack.imgur.com/a04Kh.png" alt="enter image description here"></p>