docs(aio): Add Angular Training to list of training companies (angular#23907)

PR Close angular#23907

Author: alcfeoh

aio/content/marketing/resources.json

@@ -641,6 +641,12 @@
             "title": "Angular Academy (Canada)",
             "url": "http://www.angularacademy.ca"
           },
+          "at": {
+            "desc": "Angular Training teaches Angular on-site all over the world. Also provides consulting and mentoring.",
+            "rev": true,
+            "title": "Angular Training",
+            "url": "http://www.angulartraining.com"
+          },
           "-KLIBo_lm-WrK1Sjtt-2": {
             "desc": "Basic and Advanced training across Europe in German",
             "rev": true,