Implemented CSVStorage

Tests/Tests.cs

@@ -1,4 +1,5 @@
 using System.Diagnostics.CodeAnalysis;
+using CSV_Metrics_Logger;
 
 namespace Tests;
 
@@ -81,4 +82,39 @@ public sealed class Tests
             Assert.That(dataLine, Is.EquivalentTo(new[] { "New York", "35", "1.85" }));
         });
     }
+
+    [Test]
+    public async Task TestWritingCSV()
+    {
+        List<TestDataOneLine> testData =
+        [
+            new TestDataOneLine("Name 1", 14),
+            new TestDataOneLine("Name 2", 25),
+            new TestDataOneLine("Name 3", 36),
+            new TestDataOneLine("Name 4", 47),
+            new TestDataOneLine("Name 5", 58),
+        ];
+        
+        // Get a random file:
+        var fileName = Path.GetTempFileName();
+        await using (var storage = CSVStorage<TestDataOneLine>.Create(fileName))
+        {
+            foreach (var data in testData)
+                storage.Write(data);
+        }
+        
+        var lines = await File.ReadAllLinesAsync(fileName);
+        Assert.Multiple(() =>
+        {
+            Assert.That(lines, Has.Length.EqualTo(6));
+            Assert.That(lines[0], Is.EqualTo("Name;Age"));
+            Assert.That(lines[1], Is.EqualTo("\"Name 1\";14"));
+            Assert.That(lines[2], Is.EqualTo("\"Name 2\";25"));
+            Assert.That(lines[3], Is.EqualTo("\"Name 3\";36"));
+            Assert.That(lines[4], Is.EqualTo("\"Name 4\";47"));
+            Assert.That(lines[5], Is.EqualTo("\"Name 5\";58"));
+        });
+        
+        File.Delete(fileName);
+    }
 }