Add documentation for the new Script class

docs/src/classes/script.rst

@@ -0,0 +1,21 @@
+*************************
+``Punic\Script`` class
+*************************
+
+The Script class contains several methods to work with Scripts (Script is the Unicode term that defines how languages are written, like `Latin` or `Traditional Han`).
+
+.. code-block:: php
+
+    use Punic\Script;
+    
+    var_dump(Territory::getAllScriptCodes());
+    // Output: the identifiers of all the available scripts
+    
+    var_dump(Territory::getAvailableScriptCodes('en'));
+    // Output: the identifiers of all the scripts that have available translations in a specific language
+    
+    echo Script::getScriptName('Hant');
+    // Output: the translated name of the Hant script
+    
+    var_dump(Territory::getAllScripts());
+    // Output: an array whose array are the script identifiers and the values are the translated script names