Added metager-search (#2139)

* Added metager-search

searx/settings.yml

@@ -456,6 +456,17 @@ engines:
     categories : it
     shortcut : lo
 
+  - name : metager
+    engine : xpath
+    paging : False
+    search_url : https://metager.org/meta/meta.ger3?eingabe={query}
+    url_xpath : //div[@class="result-subheadline"]/a/@href
+    title_xpath : //div[@class="result-headline"]/h2/@title
+    content_xpath : //div[@class="result-description"]/text()
+    categories : general
+    shortcut : mg
+    disabled : True
+
   - name : microsoft academic
     engine : microsoft_academic
     categories : science