Add a simple math lib example

[eugenioclrc]

No description provided.

[Philogy]

the inner pop is incorrect, the condition value gets consumed from the stack by the jumpi.

Generally for a ternary (assuming condition is a boolean value 1 / 0) the XOR based ternary method should be cheaper:

fn TERNARY<z0>(true_value, condition, false_value) -> (result) {

    result = xor(
        false_value,
        mul(condition, xor(true_value, false_value))
    )
}

[eugenioclrc]

Cool! i think i preffer a more traditional params syntax; condition, true_value, false_value