Add MariaDB installation instructions in Readme.md

Updated the Readme.md to include a link to MariaDB installation instructions. Modified the metadata and execution counts in the notebook, and added instructions for running the examples with MariaDB.

Author: zaleslaw

Readme.md

@@ -1,3 +1,5 @@
 To run these examples, you will need to install the MariaDB database server and load the dump with a database.
 
+Some installation instruction for MariaDB could be found [here](https://mariadb.com/kb/en/download/).
+
 SQL dump for the MariaDB database with the name "imdb" could be downloaded by this [link](https://drive.google.com/file/d/10HnOu0Yem2Tkz_34SfvDoHTVqF_8b4N7/view?usp=sharing).