Added XSLTTemplate, functions that add it to transform area and documentation for that function (#144)

Co-authored-by: widlam <mikolaj.widla@gmail.com>
Reviewed-on: #144
Reviewed-by: Adam Bem <bema@noreply.example.com>
Co-authored-by: Mikolaj Widla <widlam@noreply.example.com>
Co-committed-by: Mikolaj Widla <widlam@noreply.example.com>

Frontend/assets/scripts/tools/scripts.js

@@ -84,6 +84,24 @@ function fillDefaultXML(element) {
     }
 }
 
+
+/**
+ * The `fillDefaultXSLT()` function fetches a default XSLT template from the server and sets the value of the element with id "transformArea" to the fetched template.
+ * 
+ * @function
+ * @name fillDefaultXSLT
+ * @kind function
+ * @returns {void}
+ */
+function fillDefaultXSLT() {
+    const serverAddress = window.location.protocol + "//" + window.location.hostname + ":8086";
+    fetch(serverAddress + "/assets/samples/XSLTTemplate.xslt")
+        .then( response => response.text() )
+        .then( (XSTLTemplate) => {
+            document.getElementById('transformArea').value = XSTLTemplate;
+        } )   
+}
+
 /**
 * It sets default content for the element an changes it's color to grey
 *