Update CONTRIBUTING.md

- Added: YAML file naming rules
- Added: If the `metadata.json` and `metadata.schema.json` needs changes.
- Added: When adding a RlsGRp to a CF add WHY.
- Fixed: Typo

.github/CONTRIBUTING.md

@@ -10,17 +10,19 @@ These are mostly guidelines, not rules. Use your best judgment, and feel free to
 - Make sure you're editing the latest version.
 - If you propose changes make sure it doesn't break anything else in the Guides.
 - Make sure that after the changes you don't get any [markdownlint](https://github.com/markdownlint/markdownlint/blob/master/docs/RULES.md) errors
+- If the `metadata.json` and `metadata.schema.json` needs changes, announce it first in the Discord `#development` channel and ping`voidpointer` and `nitsua` so the 3rd party apps don't break :bangbang:
 
 ## Radarr/Sonarr Custom Format (JSON)
 
 - Custom Format name needs to match json name :bangbang:
-- No hashcode can exisist multiple times :bangbang:
+- No hashcode can exists multiple times :bangbang:
 - JSON file names are always written in small letters, spaces are replaced by a dash, no spaces or special characters except a dash :bangbang:
 - When adding the hashcode for Radarr use the following naming `CF_name` on the following [link+example](https://md5.gromweb.com/?string=BR-DISK).
 - When adding the hashcode for Radarr Anime use the following naming `Radarr Anime CF_name` on the following [link+example](https://md5.gromweb.com/?string=Radarr+Anime+BR-DISK).
 - When adding the hashcode for Sonarr use the following naming `Sonarr CF_name` on the following [link+example](https://md5.gromweb.com/?string=Sonarr+BR-DISK).
 - When adding the hashcode for Sonarr Anime use the following naming `Sonarr Anime CF_name` on the following [link+example](https://md5.gromweb.com/?string=Sonarr+Anime+BR-DISK).
 - Provide a link to your regex example of your Custom Format using the following [Template](https://regex101.com/r/fXmQQm/1).
+- When adding a RlsGRp to a Custom Format for what ever reason, please add in the PR why it's added/removed/moved.
 
 When adding a regex test case
 
@@ -39,6 +41,11 @@ When updating or adding a new CF the test case url needs to be added to the json
   "name": "CF_name",
 ```
 
+## YAML file naming
+
+- If a hashcode is needed **No** hashcode can exist multiple times :bangbang:
+- YAML file names are always written in small letters, spaces are replaced by a dash, no spaces or special characters except a dash :bangbang:
+
 ## Recommendations
 
 - use [VSCode](https://code.visualstudio.com/) for editing with the following extension  [markdownlint](https://marketplace.visualstudio.com/items?itemName=DavidAnson.vscode-markdownlint)