Just edit your ~/.bashrc and add this at the very end:
Then your prompt will look like this:
08:47:14 up 48 min, 1 user, load average: 1.00, 1.07, 0.96
If you wanted a dollar sign at the end then you would change it like this:
You can add other characters into it like spaces or even colon's etc into the PS1 variable above.
\h = show the hostname
\W = show the current path