Contributing

Thanks to contribute to the project. Here are some rules to make your pull requests pleasant to read and faster to integrate :)

Code style

If you don't know how to format your code, follow the style of the existing code you find in the repository.

Indent with a simple tab character, not using 2 or 4 spaces.
Don't write too long lines (not more than 80-100 characters).
Put spaces around operators (= + - * /) and after commas and colons: var a = {a: 1, b: 2} + 2 * 5.
Put spaces after if, while, for etc. : if (a > 12) {, while (true) {.

Give meaningful names to variables, avoid names like a, foo, data (except for loop counters of course).
In JavaScript, write names in camelCase : farmerName, weaponLevel etc.
In CSS, write name with dashes : #notifications-popup, .chat-messages etc.

Create one pull request per feature or bug fix you want to propose. Don't include two features in the same pull request, or one feature plus some bug fix etc.
Write a clear and meaningful pull request title and description. Explain the purpose, the context, how do you implement your solution as much as possible.
Create reasonable sized commits, avoid modifying too much different files in a single commit
Avoid mixing too different languages in a single commit, for instance, separe JavaScript modifications from the CSS and HTML ones.
Write clear and meaningful commit messages: avoid messages like bugfix, change color, many things, ..., start the message with a imperative verb, and explain clearly what the commit does, like Change the color of the chat messages.
Limit commit messages to 50 characters.
Start commit messages with a capital letter, and don't end it with a period.

More information about commits and pull requests.