improve lib and add template for libs

lib/src/commonMain/kotlin/Library.kt

@@ -1,4 +1,4 @@
-package project_group
+package project_group.project_name.lib
 
 class Library {
     fun someLibraryMethod(): Boolean {

lib/src/commonTest/kotlin/LibraryTest.kt

@@ -1,7 +1,7 @@
 /*
  * This Kotlin source file was generated by the Gradle 'init' task.
  */
-package project_group
+package project_group.project_name.lib
 
 import kotlin.test.Test
 import kotlin.test.assertTrue

lib/src/main/AndroidManifest.xml

@@ -1 +1 @@
-<manifest package="project_group.lib"/>
+<manifest package="project_group.project_name.lib"/>

template/build.gradle

@@ -0,0 +1,8 @@
+plugins {
+    id "org.jetbrains.kotlin.multiplatform"
+    id "org.jetbrains.kotlin.plugin.serialization"
+    id "com.android.library"
+}
+
+apply from: "$mppProjectWithSerializationPresetPath"
+

template/src/commonMain/kotlin/PackageInfo.kt

@@ -0,0 +1 @@
+package project_group.project_name.template

template/src/main/AndroidManifest.xml

@@ -0,0 +1 @@
+<manifest package="project_group.project_name.template"/>