Add project files.

LeagueAPI/Models/ChampSelect/ChampSelectTimer.cs

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+using System.Text.Json.Serialization;
+
+namespace LeagueAPI.Models.ChampSelect;
+
+public record class ChampSelectTimer
+{
+    [JsonPropertyName("adjustedTimeLeftInPhase")]
+    public long AdjustedTimeLeftInPhase { get; init; }
+
+    [JsonPropertyName("totalTimeInPhase")]
+    public long TotalTimeInPhase { get; init; }
+
+    [JsonPropertyName("phase")]
+    public string? Phase { get; init; }
+
+    [JsonPropertyName("isInfinite")]
+    public bool IsInfinite { get; init; }
+
+    [JsonPropertyName("internalNowInEpochMs")]
+    public ulong InternalNowInEpochMs { get; init; }
+}