feat: add a section about query builder in the advanced search guide

Signed-off-by: Nicolas Crocfer <[email protected]>

Author: ncrocfer

docs/guides/advanced_search.md

@@ -112,6 +112,26 @@ To search all CVE in 1999's:
 cve:CVE-1999
 ```
 
+## Query Builder
+
+If you're not comfortable writing advanced queries manually, OpenCVE provides a **Query Builder** to help you.
+
+![Query Builder](../images/guides/advanced_search/query-builder.png){.center style="width:100%"}
+
+This form-based tool allows you to create a query by simply filling in the fields you care about: **CVE ID**, **Description**, **Title**, **CWE**, **Vendor**, **Product**, **User Tag**, or **CVSS Score**.
+
+The Query Builder will then generate the equivalent advanced query using the **AND operator** between each field.
+
+Note:
+
+- The builder does not support `OR` logic—only `AND`.
+- It cannot reverse-engineer an existing query into the form.
+
+Look for the **Query Builder** buttons when performing advanced searches on the [vulnerabilities](https://app.opencve.io/cve/) page:
+
+![Open Query Builder](../images/guides/advanced_search/open-query-builder.png){.center style="width:100%"}
+
+
 ## Search Limitations
 
 To ensure optimal performance, advanced search queries are currently limited to **a maximum of 5 fields**. If a query exceeds this limit, it will be rejected with an error message