Add events for Stuttgart (#375)

Author: BeniRupp

events.json

@@ -25,6 +25,18 @@
         "achievements": [
         ]
     },
+    {
+        "date": "2023-05-09",
+        "venue": "codecentric AG",
+        "address": "Industriestraße 3, 70565 Stuttgart, Germany",
+        "links": [
+            {
+                "title": "Meetup",
+                "url": "https://www.meetup.com/de-DE/hackergarten-stuttgart/events/289891296/"
+            }
+        ],
+        "achievements": []
+    },
     {
         "date": "2023-05-04",
         "venue": "CSS Versicherung",
@@ -51,6 +63,18 @@
         "achievements": [
         ]
     },
+    {
+        "date": "2023-04-04",
+        "venue": "codecentric AG",
+        "address": "Industriestraße 3, 70565 Stuttgart, Germany",
+        "links": [
+            {
+                "title": "Meetup",
+                "url": "https://www.meetup.com/de-DE/hackergarten-stuttgart/events/289891284/"
+            }
+        ],
+        "achievements": []
+    },
     {
         "date": "2023-03-30",
         "title": "Hackergarten Zurich March 2023",