First of all thank you for your interest in contributing to this project :)
If you want to fix/report any bugs or add an extra module then please follow developer notes bellow. This will help us to maintain a specific structure to the project.
Try to keep app.R file minimal, only with essential lines of code. For each module, Server and UI functions should specify in a single R script (Example: module_modulename.R) and additional required functions for that modules should be in another file (Example: module_modulename_utils.R)