added dataset stats shell scriptand jenkins file

Jenkinsfile-dataset_stats

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+pipeline {
+    agent any
+    properties([parameters([
+          buildSelector(
+              defaultSelector: lastSuccessful(),
+              description: 'Which build to use for copying artifacts',
+              name: 'BUILD_SELECTOR')
+      ])])
+
+    stage('Clone repository') {
+            steps {
+                git branch: 'master', url: 'https://git.wmi.amu.edu.pl/s487176/ium_487176'
+            }
+        }
+    stage('Copy Artifacts') {
+            steps {
+                script {
+                    projectName: 'z-s487176-create-dataset',
+                    fingerprintArtifacts: true,
+                    selector: buildParameter('BUILD_SELECTOR')
+                }
+            }
+        }
+    
+    stage('Run script') {
+            steps {
+                sh 'sh datastats.sh'
+            }
+            post {
+                always {
+                    archiveArtifacts artifacts: 'stats.txt', allowEmptyArchive: true
+                }
+            }
+        }
+   
+        
+    }
+}

datastats.sh

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+#!/bin/bash
+echo "Test lines: ">stats.txt
+
+wc -l < test.csv >> stats.txt
+
+echo "Train lines: ">>stats.txt
+
+wc -l < train.csv >> stats.txt
+
+echo $"Validation lines: ">>stats.txt
+
+wc -l < val.csv >> stats.txt