Categorize issues by difficulty to help out new contributors

[stensonowen]

I'm interested in contributing to Ruma but can't really figure out where to start. A lot of the tasks in STATUS.md seem to require being very familiar with the existing codebase or making important implementation decisions. Is there something pretty straightforward I could work on first to get my feet wet?
It would help if there were more existing issues tagged with their difficulty or if more of them went into detail as to what is required. It would be helpful to have an overview of what framework a feature requires or an outline of the best way to go about starting in a way that fits well with the rest of the project. An "effort/easy" tag would also be very useful.

[farodin91]

Currently easy issues are #39 #40 or the filter API. You could use my Rust struct for filter. See in my PR for sync.

[stensonowen]

I will definitely look into them, thanks.

[farodin91]

If you need any support, you could ask me on Martix same Name.

[jimmycuadra]

Agreed we need to do more of this. The ones that don't have a difficulty label are mostly because no one has made an estimate about how hard the various tasks are. Often it's hard to know how difficult something will be until you try it.

ruma/ruma#115 is super easy one for a first contribution.