android: bootstrap phase-0 compose project skeleton

android/app/src/main/java/ru/daemonlord/messenger/MainActivity.kt

@@ -0,0 +1,43 @@
+package ru.daemonlord.messenger
+
+import android.os.Bundle
+import androidx.activity.ComponentActivity
+import androidx.activity.compose.setContent
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.padding
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.Surface
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.unit.dp
+
+class MainActivity : ComponentActivity() {
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setContent {
+            MaterialTheme {
+                Surface(modifier = Modifier.fillMaxSize()) {
+                    AppRoot()
+                }
+            }
+        }
+    }
+}
+
+@Composable
+private fun AppRoot() {
+    Column(
+        modifier = Modifier
+            .fillMaxSize()
+            .padding(24.dp),
+        verticalArrangement = Arrangement.Center,
+        horizontalAlignment = Alignment.CenterHorizontally
+    ) {
+        Text(text = "Benya Messenger Android", style = MaterialTheme.typography.headlineSmall)
+        Text(text = "Phase 0 skeleton is ready.", style = MaterialTheme.typography.bodyMedium)
+    }
+}