Update README.md

Author: poralcode

README.md

@@ -6,6 +6,7 @@ There are only two classes in this project.<br>
 [Main.java ](https://github.com/poralcode/CSV-Validation/blob/origin/src/main/java/Main.java "Main.java ")- The main class that contains the logic for reading the CSV file.<br>
 [Validation.java](https://github.com/poralcode/CSV-Validation/blob/origin/src/main/java/Validation.java "Validation.java") - The class that provides validation logic for the fields in a CSV file.
 
+Unit Test: [ValidationTest.java ](https://github.com/poralcode/CSV-Validation/blob/origin/src/test/java/ValidationTest.java "ValidationTest.java ")
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