Added link to TactxStudios tutorials

docs/en/en.json

@@ -136,6 +136,10 @@
                     {
                         "path": "https://jcash.github.io/",
                         "name": "JCash demos"
+                    },
+                    {
+                        "path": "https://www.tactxstudios.com/",
+                        "name": "Tactx Studios"
                     }
                 ]
             }