php-sqlite 3 must installed in order to run queries using PDO technique.

I had to run `sudo apt install php-sqlite3` in order to get the line queries to run without an error. Before running `sudo apt install php-sqlite3`, I received this error in the Bash terminal:
```
127.0.0.1:60862 [500]: / - Uncaught Error: Call to a member function fetchAll() on boolean in /home/someone/Desktop/practice-php/index.php:22
Stack trace:
#0 {main}
thrown in /home/rob/Desktop/practice-php/index.php on line 22
```

Read index.php around line 22 and reproduce the PDO query after checking whether php-sqlite3 is available. Compare the project setup with the reported dependency requirement. Done means the expected setup is explicit and the query no longer produces the fetchAll-on-boolean error.

Written by the indexing model from the issue text.