Prototype release (v0.1)

I wanted to follow the principle of "make it exist," then "make it better," and maybe one day "make it profit (fame/money)".

It's very incomplete, but I already know which areas need improvement

(currently, all missions are automatically successful).

1. I want to add a mission success calculation system based on the heroes sent and the items taken.

2. I want to redesign the money counting system to display the total cost and income (with a summary just before starting the quest).

3. There is a very incomplete debug mode activated by pressing F10; I want to improve it to make debugging the game easier.

4. UX: Add a popup to confirm when launching a quest, and a popup when quitting the game.