Build menu + basic help page

Somewhat smaller but still good update. Now you can build  your own buildings :D Even though you have a very limited amount of money, you might try to earn it fulfilling the demands of a trading post. Unfortunately, trading post is not very balanced yet. But, maybe it's a part of the challenge at the current point of development. 

Another thing that I think was important, is a quick help, so at least some basic concepts would be clearer to the players. You can find the button on the top bar. Hope it will make your life easier.

Really looking forward to your feedback! ❤️