Added class to handle incorrect parameters

src/task/TaskIncorrectParams.java

+package task;
+
+public final class TaskIncorrectParams extends TaskImpl {
+
+    public TaskIncorrectParams(String input) {
+        super(input);
+    }
+
+    @Override
+    public void execute() { }
+
+    @Override
+    public String getResult() {
+        return "ERROR: A task must have 2 parameters.\n";
+    }
+}
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