Add project files.

Lantean.QBitTorrentClient/Converters/StringFloatJsonConverter.cs

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+using System.Text.Json;
+using System.Text.Json.Serialization;
+
+namespace Lantean.QBitTorrentClient.Converters
+{
+    internal class StringFloatJsonConverter : JsonConverter<float>
+    {
+        public override float Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
+        {
+            if (reader.TokenType == JsonTokenType.String)
+            {
+                if (float.TryParse(reader.GetString(), out var value))
+                {
+                    return value;
+                }
+
+                return 0;
+            }
+
+            if (reader.TokenType == JsonTokenType.Number)
+            {
+                if (reader.TryGetSingle(out var value))
+                {
+                    return value;
+                }
+
+                return 0;
+            }
+
+            return 0;
+        }
+
+        public override void Write(Utf8JsonWriter writer, float value, JsonSerializerOptions options)
+        {
+            writer.WriteStringValue(value.ToString());
+        }
+    }
+}