Checks if the given text is present in the page.
Returns true if it's present; false if otherwise.

*Example:*
| ${isTextPresent}= | `Is Text Present` | Desired Text |

=>

| ${isTextPresent} = True   # or ${isTextPresent} = False

The value can be evaluated to run another keyword. 
i.e.  

| `EL Run Keyword If`    |  $[var('isTextPresent') eq true]   | My Keyword  |