Set up multiplatform structure

composeApp/src/androidMain/kotlin/ru/fromchat/MainActivity.kt

@@ -0,0 +1,17 @@
+package ru.fromchat
+
+import android.os.Bundle
+import androidx.activity.ComponentActivity
+import androidx.activity.compose.setContent
+import androidx.activity.enableEdgeToEdge
+import ru.fromchat.ui.App
+
+class MainActivity : ComponentActivity() {
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        enableEdgeToEdge()
+        setContent {
+            App()
+        }
+    }
+}