Added a helper static class to store data about pokemons.

[WIP] Add CRUD and trainers

[WIP] Update OpenAPI

Practical session 3

Completed the second issue by adding a button that toggles a form of creating a new trainer. The new trainer information is automatically inserted into the table.

New page called "Trainers.html" has been created along with respective javascript that dynamically displays the information about pokemon trainers presented in the table.