Start publishing velocity-natives module

Note that this will remain internal API for Velocity and the publication of the module does not necessarily indicate that they will be stable.

gradle/publish.gradle

@@ -0,0 +1,16 @@
+publishing {
+    repositories {
+        maven {
+            credentials {
+                username System.getenv("NEXUS_USERNAME")
+                password System.getenv("NEXUS_PASSWORD")
+            }
+
+            name = 'velocity-nexus'
+            def base = 'https://nexus.velocitypowered.com/repository/velocity-artifacts'
+            def releasesRepoUrl = "$base-releases/"
+            def snapshotsRepoUrl = "$base-snapshots/"
+            url = version.endsWith('SNAPSHOT') ? snapshotsRepoUrl : releasesRepoUrl
+        }
+    }
+}