Add payload

[acaetano]

Idea:
use xml tags to specify the field to be fuzzed. Maybe something like typeofvalue.

Example:

<xml>
    <field1>Title</field1>
    <field2><fuzzml>int</fuzzml></field2>
    <field3><fuzzml>string</fuzzml></field3>
</xml>

Or maybe

<xml>
    <field1>Title</field1>
    <fuzzml method='fuzzing_method'>
    <field2>26753761</field2>
    </fuzzml>
    <field3>oasudhas</field3>
</xml>