add chat basics

feature/updater/updater-common/src/commonMain/kotlin/UpdateFetcher.kt

@@ -0,0 +1,9 @@
+package ru.shadowsparky.updater.domain
+
+interface UpdateFetcher {
+    suspend fun fetch(versionCode: Long): UpdateInfo
+
+    companion object {
+        const val ARG_VERSION_CODE = "versionCode"
+    }
+}