Add CONTRIBUTING.md, mention mojmap being ARR (#1222)

* Add CONTRIBUTING.md, mention mojmap being ARR

Closes #1221. Created CONTRIBUTING.md file that is basically
a copy-paste from the README.

Closes #1209. CONVENTIONS.md now mentions that names from
mojmap should not be used.

* Suggestions

CONTRIBUTING.md

@@ -0,0 +1,8 @@
+# Contributing
+
+Please remember that copying and pasting mappings from alternate projects under more restrictive licenses (such as MCP or Mojang's obfuscation maps)
+is **completely forbidden** without explicit permission from the owners of said mappings to distribute the names under the CC0 license.
+This includes using the names from those mappings for inspiration. Discussing the naming approaches used in said projects
+is also not welcome - you have been warned. However, it is a good idea to consult name changes with other people - use pull requests or our community spaces to ask questions!
+
+Please have a look at the [naming conventions](/CONVENTIONS.md) before submitting mappings.

CONVENTIONS.md

@@ -115,6 +115,8 @@ Name screen coordinates `x` and `y`, rather than `left` and `top`.
 
 ## Mojang names
 
+**Do not use names from Mojang's obfuscation maps.**
+
 Use names that match names in strings in the vanilla code, unless that string is outdated or inaccurate. This avoids confusion,
 especially from new modders who may not understand what an class exception message is referring to.
 

README.md

@@ -12,9 +12,10 @@ To obtain a deobfuscated Minecraft jar, [`./gradlew mapNamedJar`](#mapNamedJar)
 
 ## Contributing
 
-Please remember that copying and pasting mappings from alternate projects under more restrictive licenses (such as MCP) is **completely forbidden** without explicit permission from the 
-owners of said mappings. Discussing the naming approaches used in said projects is also not welcome - you have been warned.
-However, it is a good idea to consult name changes with other people - use pull requests or our community spaces to ask questions!
+Please remember that copying and pasting mappings from alternate projects under more restrictive licenses (such as MCP or Mojang's obfuscation maps)
+is **completely forbidden** without explicit permission from the owners of said mappings to distribute the names under the CC0 license.
+This includes using the names from those mappings for inspiration. Discussing the naming approaches used in said projects
+is also not welcome - you have been warned. However, it is a good idea to consult name changes with other people - use pull requests or our community spaces to ask questions!
 
 Please have a look at the [naming conventions](/CONVENTIONS.md) before submitting mappings.