Add migration readme

migration/README

+#Make list videos and files from database
+cd /pod/src && python manage.py shell < /pod/REPRISE/esup-pod-api-sample/migration/list-files-url-from-db.py > /pod/REPRISE/esup-pod-api-sample/migration/media_files_list_db.txt
+cd /pod/src && python manage.py shell < /pod/REPRISE/esup-pod-api-sample/migration/list-videos-url-from-db.py > /pod/REPRISE/esup-pod-api-sample/migration/media_videos_list_db.txt
+
+#Make list videos and files from filesystem
+python /pod/REPRISE/esup-pod-api-sample/migration/list-files-url-from-fs.py > /pod/REPRISE/esup-pod-api-sample/migration/media_files_list_fs.txt
+python /pod/REPRISE/esup-pod-api-sample/migration/list-videos-url-from-fs.py > /pod/REPRISE/esup-pod-api-sample/migration/media_videos_list_fs.txt
+
+#Download videos and files from url
+python /pod/REPRISE/esup-pod-api-sample/migration/download-videos-from-url.py
+python /pod/REPRISE/esup-pod-api-sample/migration/download-files-from-url.py
+
+#Test after download if videos and files are all present on filesystem
+python /pod/REPRISE/esup-pod-api-sample/migration/test-videos-after-download.py
+python /pod/REPRISE/esup-pod-api-sample/migration/test-files-after-download.py
+
+
+#some diff
+cat /pod/REPRISE/esup-pod-api-sample/migration/media_videos_list_db.txt |sort -u > /pod/REPRISE/esup-pod-api-sample/migration/media_videos_list_db_sort.txt
+cat /pod/REPRISE/esup-pod-api-sample/migration/media_videos_list_fs.txt |sort -u > /pod/REPRISE/esup-pod-api-sample/migration/media_videos_list_fs_sort.txt
+
+wc -l /pod/REPRISE/esup-pod-api-sample/migration/media_videos_list_db.txt
+wc -l /pod/REPRISE/esup-pod-api-sample/migration/media_videos_list_db_sort.txt
+wc -l /pod/REPRISE/esup-pod-api-sample/migration/media_videos_list_fs.txt
+wc -l /pod/REPRISE/esup-pod-api-sample/migration/media_videos_list_fs_sort.txt
+diff -urb /pod/REPRISE/esup-pod-api-sample/migration/media_videos_list_db_sort.txt /pod/REPRISE/esup-pod-api-sample/migration/media_videos_list_fs_sort.txt
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