Add compose-multiplatform-html-unified

[ShreckYe]

This library has multiple Maven modules and I have only linked the most representative one in the JSON maven field. If OK, the Maven link can be changed to our organization link https://repo1.maven.org/maven2/com/huanshankeji, which also contains other libraries though, or a wildcard link pattern like https://repo1.maven.org/maven2/com/huanshankeji/compose-multiplatform-html-unified-*/.