Update 'README.md'

README.md

 
 `terminal` or `shell` mean pretty much the same thing - `/Applications/Utilities/Terminal.app` and start it up.
 
+![Terminal Icon](./termicon.png)
+
 Type `whoami` and `enter` or `return`. Congratulations, you just typed a command. You're Welcome.
 
 now, type `git --version` and make note of what comes back, the version number of git.