link card added

assets/cards/link_card.json

+{
+    "type": "AdaptiveCard",
+    "$schema": "http://adaptivecards.io/schemas/adaptive-card.json",
+    "version": "1.5",
+    "body": [
+        {
+            "type": "Container",
+            "items": [
+                {
+                    "type": "TextBlock",
+                    "wrap": true,
+                    "text": "Open secured portal"
+                }
+            ]
+        },
+        {
+            "type": "Container",
+            "items": [
+                {
+                    "type": "ActionSet",
+                    "actions": [
+                        {
+                            "type": "Action.OpenUrl",
+                            "title": "$title",
+                            "url": "$url"
+                        }
+                    ]
+                }
+            ]
+        }
+    ]
+}
\ No newline at end of file