feat: add hello_team.py with datetime greeting and minimal requirements.txt

hello_team.py

@@ -0,0 +1,8 @@
+from datetime import datetime
+
+def main():
+    now = datetime.now().strftime("%Y-%m-%d %H:%M:%S")
+    print(f"Hello from the AI Dev Team — {now}")
+
+if __name__ == "__main__":
+    main()

requirements.txt

@@ -0,0 +1 @@
+# No external dependencies required