Add script and Jenkinsfile for zadanie 3.8

Jenkinsfile_stats

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+pipeline {
+    agent any
+    stages {
+        stage('copyArtifacts') {
+            steps {
+                copyArtifacts fingerprintArtifacts: true, projectName: 's434684-create-dataset', selector: buildParameter('CREATE_DATASET_BUILD_SELECTOR')
+            }
+        }
+        stage('script stats') {
+            steps {
+                sh 'chmod +x jenkins_stats_script.sh'
+				sh './jenkins_stats_script.sh'
+            }
+        }
+        stage('archiveArtifacts') {
+            steps {
+                archiveArtifacts 'dataset-stats.txt'
+            }
+        }
+    }
+}

jenkins_stats_script.sh

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+#!/bin/bash
+wc -l netflix_split_train.csv > dataset-stats.txt
+wc -l netflix_split_test.csv >> dataset-stats.txt
+wc -l netflix_split_validation.csv >> dataset-stats.txt