[openstreetmap/openstreetmap-website] Add labels documentation to CONTRIBUTING.md (#3011)

[Tucker Chapman]

@tuckerrc pushed 1 commit.

c392fcb103e1acd6f84884cefdb2224d6aafe8eb  Create PR specific label section


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View it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/pull/3011/files/fc725ca385fb5689c2ec92855fab0dff74e02ccd..c392fcb103e1acd6f84884cefdb2224d6aafe8eb
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