[FEATURE] Add `ShieldsIo` class

[guibranco]

Description

Add a class named ShieldsIo with the following methods:

• generateBadgeUrl

Please take a look at shields.io docs for extra parameters and URL structure. The following example is fully functional (it needs to be refactored and tests and documentation added).

Tech notes

The basic implementation of the method GenerateBadgeUrl should be something similar to this: (feel free to change, add new features, or make any improvements!)

• The str_replace calls could be grouped in a single method and reduce the code cyclomatic complexity, reducing operations inside this method.
• We can handle other (optional) parameters to generate the badge (refer to shields.io docs, but this is not a current requirement).

function generateBadgeUrl($label, $content, $color, $style, $labelColor, $logo)
{
    $badge = "";

    if (isset($label) && !empty($label)) {
        $label = str_replace("_", "__", $label);
        $label = str_replace(" ", "_", $label);
        $label = str_replace("-", "--", $label);
        $label = str_replace("/", "%2F", $label);
        $label = str_replace("#", "♯", $label);
        $badge .= $label . "-";
    }

    if (isset($content) && !empty($content)) {
        $content = str_replace("_", "__", $content);
        $content = str_replace(" ", "_", $content);
        $content = str_replace("-", "--", $content);
        $content = str_replace("/", "%2F", $content);
        $content = str_replace("#", "♯", $content);
        $badge .= $content . "-";
    }

    if (isset($color) && !empty($color)) {
        $badge .= $color;
    }

    $queryString = "";
    if (isset($style) && !empty($style)) {
        $queryString .= "style=" . $style . "&";
    }

    if (isset($labelColor) && !empty($labelColor)) {
        $queryString .= "labelColor=" . $labelColor . "&";
    }

    if (isset($logo) && !empty($logo)) {
        $queryString .= "logo=" . $logo;
    }

    return "https://img.shields.io/badge/" . $badge . "?" . $queryString;
}

Additional information

⚠️ 🚨 Add documentation and tests

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