Created Poll Maker plugin

Plugins/PollMaker/Internal/PollState.cs

@@ -0,0 +1,32 @@
+namespace PollMaker.Internal;
+
+internal sealed record PollState(string Question, string[] Options)
+{
+    public List<HashSet<ulong>> Votes { get; } =
+        Enumerable.Range(0, Options.Length).Select(_ => new HashSet<ulong>()).ToList();
+
+    public bool IsOpen { get; private set; } = true;
+
+    public void Close() => IsOpen = false;
+
+    /// <summary>
+    /// Toggle the member’s vote.  
+    /// Clicking the **same button** again removes their vote;  
+    /// clicking a **different** button moves the vote.
+    /// </summary>
+    public void ToggleVote(int optionIdx, ulong userId)
+    {
+        if (!IsOpen) return;
+            
+        if (Votes[optionIdx].Contains(userId))
+        {
+            Votes[optionIdx].Remove(userId);
+            return;
+        }
+            
+        foreach (var set in Votes)
+            set.Remove(userId);
+
+        Votes[optionIdx].Add(userId);
+    }
+}