Rewrite parts of "adding armor" guide that are unclear or outdated
I've found some inaccuracies or unclear instructions while trying to follow the armor creation guide, so I've tried to correct them.
- The guide did not have instructions for armor items that are dropped on the ground, so they would show up as question marks.
- Was missing clarification that the item names must match the file paths.
- The guide would mention that the game files have a character template, but not where to find it.
- The chat command would result in item creation attempt with a name of "common.items.common.items.armor..."
- Chat command was expected to succeed, no troubleshooting instructions for when it fails.
- Order in naming scheme seemingly different from the one used by the game
- Numeric item stats definition caused the game client to crash
I've also added a short mention of crafting recipe instructions since that was something I expected to see instructions for. In the future it could be replaced by a link to a more in-depth guide.