Add new 'CoverageBadge' library

This commit introduces the 'CoverageBadge' library designed to create an SVG coverage badge from a Clover XML file. Various files including README.md, badge.svg template file, coverage-badge.php, and composer.json have been added detailing installation, usage, and other necessary information.

Author: mohanrajpac

README.md

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+# CoverageBadge
+
+CoverageBadge is a library for creating an SVG coverage badge from a Clover XML file.
+
+## Installation
+
+Composer!
+
+
+## Usage
+
+1. Generate [XML Code Coverage](https://phpunit.de/manual/current/en/logging.html#logging.codecoverage.xml) using [PHPUnit](https://phpunit.de/manual/current/en/appendixes.configuration.html#appendixes.configuration.logging)
+2. Run `vendor/bin/coverage-badge /path/to/clover.xml /path/to/badge/destination.svg type_of_test`
+    * e.g. `vendor/bin/php-coverage-badge build/clover.xml report/coverage.svg unit-test`

bin/coverage-badge

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+#!/usr/bin/env php
+<?php
+include(__DIR__ . '/../coverage-badge.php');

composer.json

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+{
+    "name": "codebtech/coveragebadge",
+    "description": "Creates code coverage badge from a Clover XML file.",
+    "type": "library",
+    "license": "MIT",
+    "homepage": "https://github.com/codebtech/coveragebadge",
+    "authors": [
+        {
+            "name": "Mohan Raj",
+            "homepage": "https://github.com/m0hanraj"
+        }
+    ],
+    "bin": [
+        "bin/coverage-badge"
+    ]
+}

coverage-badge.php

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+<?php
+
+$inputFile  = $argv[1];
+$outputFile = $argv[2];
+$coverageName = isset($argv[3]) ? $argv[3] : 'coverage';
+
+if (!file_exists($inputFile)) {
+    throw new InvalidArgumentException('Invalid input file provided');
+}
+
+try {
+    $xml = new SimpleXMLElement(file_get_contents($inputFile));
+
+    $metrics         = $xml->xpath('//metrics');
+    $totalElements   = 0;
+    $checkedElements = 0;
+
+    foreach ($metrics as $metric) {
+        $totalElements   += (int) $metric['elements'];
+        $checkedElements += (int) $metric['coveredelements'];
+    }
+
+    $coverage = (int)(($totalElements === 0) ? 0 : ($checkedElements / $totalElements) * 100);
+
+    $template = file_get_contents(__DIR__ . '/templates/badge.svg');
+
+    $template = str_replace('{{ total }}', $coverage, $template);
+
+    $template = str_replace('{{ coverage }}', $coverageName, $template);
+
+    $color = '#a4a61d';      // Default Gray
+    if ($coverage < 40) {
+        $color = '#e05d44';  // Red
+    } elseif($coverage < 60) {
+        $color = '#fe7d37';  // Orange
+    } elseif($coverage < 75) {
+        $color = '#dfb317';  // Yellow
+    } elseif($coverage < 90) {
+        $color = '#a4a61d';  // Yellow-Green
+    } elseif($coverage < 95) {
+        $color = '#97CA00';  // Green
+    } elseif ($coverage <= 100) {
+        $color = '#4c1';     // Bright Green
+    }
+
+    $template = str_replace('{{ total }}', $coverage, $template);
+    $template = str_replace('{{ color }}', $color, $template);
+
+    file_put_contents($outputFile, $template);
+} catch (Exception $e) {
+    echo $e->getMessage();
+}
+
+