add template for startup and readme

startup/template/client/src/commonMain/kotlin/ClientPlugin.kt

@@ -0,0 +1,15 @@
+package group_name.module_name.client
+
+import dev.inmo.micro_utils.startup.plugin.StartPlugin
+import kotlinx.serialization.json.JsonObject
+import org.koin.core.Koin
+import org.koin.core.module.Module
+
+object ClientPlugin : StartPlugin {
+    override fun Module.setupDI(config: JsonObject) {
+    }
+
+    override suspend fun startPlugin(koin: Koin) {
+        super.startPlugin(koin)
+    }
+}