How to contribute to project

There are mainly two sections, code and documentation.

For contributing to codes:

Please use existing objects like Force, Matrix, Displacement etc. while not creating new data objects as much as possible.
Please document methods and properties
Please note that being compact and simple to use is appreciated in code.
Please create a code that be simple to maintain also simple to understand, at least in class design level.

For contributing to documentation:

Please use images for illustrating phisical stuff
Please note the units of values you use in examples