Generate License URL as well

So, we can mention it in the README for better convenience

Author: pH-7

src/Command/Markdown/Builder.php

@@ -26,6 +26,7 @@ public function __construct(array $data)
         $this->authorName = $data['author'];
         $this->authorEmail = $data['email'];
         $this->licenseType = $data['license'];
+        $this->licenseLink = License::getLicenseLink($data['license']);
     }
 
     public function save(string $path): bool|int
@@ -56,7 +57,8 @@ private function parse(string $contents): string
                 $this->description,
                 $this->authorName,
                 $this->authorEmail,
-                $this->licenseType
+                $this->licenseType,
+                $this->licenseLink,
             ],
             $contents
         );

src/Command/Markdown/License.php

@@ -4,10 +4,42 @@
 
 final class License
 {
+    private const ISC = 'ISC';
+    private const MIT = 'MIT';
+    private const GPL = 'GPL';
+    private const BSD = 'BSD';
+    private const MPL = 'MPL';
+    private const AGPL = 'AGPL'
+
     public const CODES = [
-        'ISC',
-        'MIT',
-        'GPL',
-        'BSD'
+        self::ISC,
+        self::MIT,
+        self::GPL,
+        self::BSD,
+        self::MPL,
+        self::AGPL,
     ];
+
+    public static function getLicenseLink($licenseType)
+    {
+        switch ($licenseType) {
+            case self::ISC:
+                return 'https://opensource.org/licenses/ISC';
+
+            case self::MIT:
+                return 'https://opensource.org/licenses/MIT';
+
+            case self::GPL:
+                return 'https://www.gnu.org/licenses/gpl.html';
+
+            case self::MPL:
+                return 'https://www.mozilla.org/en-US/MPL/';
+
+            case self::AGPL:
+                return 'https://www.gnu.org/licenses/agpl.html';
+
+            default:
+                return 'https://opensource.org/licenses/';
+        }
+    }
 }