initial commit
adds first version of the double pendulum simulator
updates README
fixes typo on documentation
draws bobs with different sizes to better reflect their masses
makes window resizable and allows user to specify initial window geometry
adds comment
adds missing usage instructions
adds more spacing on usage instructions
adds key press detection: up/down arrow keys increase/decrease the time step
toggles verbose mode when 'v' is pressed
disassociates the draw function from the pendulum class
moves pendulum_system to its own module
improves documentation
removes unnecessary variables
adds simulator based on the Euler-Lagrange equations
adds missing factor on equation
fixes documentation
fixes documentation