Roadmap info!

Browsing and noticed that 2014 and 2024 have differences, which makes sense given 2024 is new. I believe a ROADMAP could be handy for folks to help out & know what is already being worked on. I see:

```javascript
// 2014 resources
[
"ability_scores",
"alignments",
"backgrounds",
"classes",
"conditions",
"damage_types",
"equipment",
"equipment_categories",
"feats",
"features",
"languages",
"levels",
"magic_items",
"magic_schools",
"monsters",
"proficiencies",
"races",
"rule_sections",
"rules",
"skills",
"spells",
"subclasses",
"subraces",
"traits",
"weapon_properties"
]
// 2024 resources
[
"ability_scores",
"alignments",
"backgrounds",
"conditions",
"damage_types",
"equipment",
"equipment_categories",
"feats",
"languages",
"magic_schools",
"proficiencies",
"skills",
"weapon_mastery_properties",
"weapon_properties"
]
```
I bet Monsters will be quite the undertaking, given the 2024 changes.