Add UI for coins

[seeziyang]

• Add reducers for coins
• Add reducers for inventory
• Add UI button for coins, feel free to change it to add the coin circle in front or smthg HAHA ps i dont have photoshop
• Currently, clicking the button will increase the coin amount, this is just for testing the reducers, maybe next time it can open a UI to buy more coins or something
• No idea why the person move to top right when I click on the coins button tho oops
• Video demo on tele cos its too big to upload here

[haveaqiupill]

• Add UI button for coins, feel free to change it to add the coin circle in front or smthg HAHA ps i dont have photoshop

I just merged some asset files with coins related assets under assets/coins/...

• Currently, clicking the button will increase the coin amount, this is just for testing the reducers, maybe next time it can open a UI to buy more coins or something

Let me know what assets you need for this!

• No idea why the person move to top right when I click on the coins button tho oops

Need to hardcode and add the coordinates of the coin panel to the checkInMovableRange function in GameUtils.js. Can add the coordinates to the constant.js file as well! :)