message: Add TODO and FIXME convention to CONTRIBUTING.md
diff: @@ -205,6 +205,22 @@ declare class AVSettings {
  }
  ```
  +#### Marking things for future changes
  +
  +There are some comments we use to mark places in the code, where we should have a look later on. For things that could
  +be extended or improved later, but are not needed for the proper functioning of the types, TODO comments can be used.
  +```typescript
  +// TODO: Some description to explain what should be done
  +```
  +
  +When updating types, especially between major Foundry versions, it happens that types are referenced in one class, that
  +are not defined or updated yet. In those cases FIXME comments should be used. Ideally those should also have the final
  +type code in their description. In general it is favorable to have these places just commented instead of the types not
  +compiling.
  +```typescript
  +// FIXME: SomeNotYetExistingType // This will be added in PR #...
  +```
  +
  ## Final Words
  If you've made it this far: Thanks for reading and for trying to contribute. It is much appreciated. We're hoping to see
  