FEAT-modin-project#2447: add instructions for building docker images

Signed-off-by: Anatoly Myachev <anatoly.myachev@intel.com>

examples/docker/census-on-omnisci/build-docker-image.sh

@@ -13,6 +13,11 @@
 # ANY KIND, either express or implied. See the License for the specific language
 # governing permissions and limitations under the License.
 
+echo "Note: a user is responsible for preparing the dataset.
+The dataset must be named as 'ipums_education2income_1970-2010.csv' and
+be in the folder with 'census-omnisci.dockerfile'. It can be downloaded by link:
+'https://rapidsai-data.s3.us-east-2.amazonaws.com/datasets/ipums_education2income_1970-2010.csv.gz'"
+
 cd "`dirname \"$0\"`"
 
 docker build -f census-omnisci.dockerfile -t census-omnisci --build-arg no_proxy \

examples/docker/taxi-on-omnisci/build-docker-image.sh

@@ -13,6 +13,11 @@
 # ANY KIND, either express or implied. See the License for the specific language
 # governing permissions and limitations under the License.
 
+echo "Note: a user is responsible for preparing the dataset.
+The dataset must be named as 'trips_xaa.csv' and be in the folder with 'nyc-taxi-omnisci.dockerfile'.
+It Can be generated by following the instructions on the link:
+'https://github.com/toddwschneider/nyc-taxi-data#instructions'"
+
 cd "`dirname \"$0\"`"
 
 docker build -f nyc-taxi-omnisci.dockerfile -t nyc-taxi-omnisci --build-arg https_proxy --build-arg http_proxy .