Add libs.versions.toml example for compose dependencies

Author: bitspittle

COMPATIBILITY.md

@@ -45,3 +45,10 @@ in sync to avoid unexpected issues.
 [^compose]: Kobweb depends
 on [AndroidX Compose Runtime](https://mvnrepository.com/artifact/androidx.compose.runtime/runtime)
 and [JetBrains Compose HTML](https://mvnrepository.com/artifact/org.jetbrains.compose.html/html-core).
+
+    compose-html = "..."
+    compose-runtime = "..."
+
+    [libraries]
+    compose-html-core = { module = "org.jetbrains.compose.html:html-core", version.ref = "compose-html" }
+    compose-runtime = { module = "androidx.compose.runtime:runtime", version.ref = "compose-runtime" }