UX Data Broker Transform Starter Template (#1573)

* Create template.js

Added a starter template for a transform data resource. This template contains:
- JSDoc type annotations
- Destructured inputs
- Try/catch
- Error logging then throw (Enables error logging but still allows the data resource to fail)
- An example of what the properties object should look like

* Create readme.md

* Update readme.md

Fixed incorrect JSDoc optional syntax

* Update template.js

Fixed incorrect JSDoc optional syntax

UX Data Broker Transform/starter-template/readme.md

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+# Transform Data Broker Template
+
+This repository provides a starter template for creating Transform Data Brokers in ServiceNow’s UX framework. This template includes error handling, input validation, and JSDoc annotations for a streamlined setup.
+
+## Features
+
+- **JSDoc Type Annotations** for clarity and type-checking.
+- **Destructured Inputs** for simplified parameter handling.
+- **Error Logging & Propagation**: Logs errors while allowing the data resource to fail if needed.
+- **Properties Example**: Provides an example of what the properties should look like
+
+## Template Overview
+
+```javascript
+/**
+ * @param {{param1: string, param2: number, param3?: boolean}} inputs 
+ * Inputs from the properties field above; param1 and param2 are mandatory.
+ * @returns {string} The value returned after transformation.
+ */
+function transform({ param1, param2, param3 }) {
+  const lib = "Data Broker";
+  const func = "<insert data broker name here>";
+  let res;
+
+  try {
+    if (!param1) throw new Error("Missing required param 'param1'");
+    if (!param2) throw new Error("Missing required param 'param2'");
+
+    // Add transformation logic here
+
+    return res;
+  } catch (e) {
+    gs.error(`${lib} ${func} - ${e}`);
+    throw new Error(e);
+  }
+}
+
+/**
+ * TIPS
+ * Make sure to flag mutates data if your data resource changes any data
+ * Properties structure (these are the inputs for your data resource):
+ [
+    {
+        "name": "param1",
+        "label": "Param 1",
+        "description": "An example of the first param as a string, mandatory",
+        "readOnly": false,
+        "fieldType": "string",
+        "mandatory": true,
+        "defaultValue": ""
+    },
+    {
+        "name": "param2",
+        "label": "Param 2",
+        "description": "An example of the second param as a number, mandatory",
+        "readOnly": false,
+        "fieldType": "number",
+        "mandatory": true,
+        "defaultValue": ""
+    },
+    {
+        "name": "param3",
+        "label": "Param 3",
+        "description": "An example of the third param as a boolean, optional",
+        "readOnly": false,
+        "fieldType": "boolean",
+        "mandatory": false,
+        "defaultValue": ""
+    }
+  ]
+ */
+```

UX Data Broker Transform/starter-template/template.js

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+/**
+ * This is a starter template for a transform data broker with:
+ * - JSDoc type annotations
+ * - Destructured inputs
+ * - Try/catch
+ * - Error logging then throw (Enables error logging but still allows the data resource to fail)
+ * @param {{param1: string, param2: number, param3?: boolean}} inputs inputs from the properties field above, param1 and param2 are mandatory
+ * @returns {string} the value returned
+ */
+function transform({ param1, param2, param3 }) {
+  const lib = "Data Broker";
+  const func = "<insert data broker name here>";
+
+  /** @type {string} */
+  let res;
+
+  try {
+    // Handle required param checks
+    if (!param1) throw new Error("Missing required param 'param1'");
+    if (!param2) throw new Error("Missing required param 'param2'");
+
+    // Add logic here
+
+    return res;
+  } catch (e) {
+    gs.error(`${lib} ${func} - ${e}`);
+    throw new Error(e);
+  }
+}
+
+/**
+ * TIPS
+ * Make sure to flag mutates data if your data resource changes any data
+ * Properties structure (these are the inputs for your data resource):
+ [
+    {
+        "name": "param1",
+        "label": "Param 1",
+        "description": "An example of the first param as a string, mandatory",
+        "readOnly": false,
+        "fieldType": "string",
+        "mandatory": true,
+        "defaultValue": ""
+    },
+    {
+        "name": "param2",
+        "label": "Param 2",
+        "description": "An example of the second param as a number, mandatory",
+        "readOnly": false,
+        "fieldType": "number",
+        "mandatory": true,
+        "defaultValue": ""
+    },
+    {
+        "name": "param3",
+        "label": "Param 3",
+        "description": "An example of the third param as a boolean, optional",
+        "readOnly": false,
+        "fieldType": "boolean",
+        "mandatory": false,
+        "defaultValue": ""
+    }
+  ]
+ */