[feat] mash-up-kr#111 KeyLinkApp 및 KeyLinkAppState 추가

* bottomBar
* snackbarhost에 KeyLinkSnackbar 연결
* NavHost
* appState

presentation/src/main/java/com/mashup/presentation/KeyLinkApp.kt

@@ -0,0 +1,53 @@
+package com.mashup.presentation
+
+import androidx.compose.foundation.layout.padding
+import androidx.compose.material.Scaffold
+import androidx.compose.material.SnackbarDuration
+import androidx.compose.material.SnackbarHostState
+import androidx.compose.material.SnackbarResult
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.remember
+import androidx.compose.ui.Modifier
+import com.mashup.presentation.navigation.KeyLinkNavHost
+import com.mashup.presentation.ui.common.KeyLinkSnackBar
+import com.mashup.presentation.ui.theme.Black
+
+/**
+ * Ssam_D_Android
+ * @author jaesung
+ * @created 2023/07/04
+ */
+@Composable
+fun KeyLinkApp(
+    appState: KeyLinkAppState = rememberKeyLinkAppState()
+) {
+    val snackbarHostState = remember { SnackbarHostState() }
+
+    Scaffold(
+        bottomBar = {
+            if (appState.isBottomBarVisible()) {
+                KeyLinkBottomNavigationBar()
+            }
+        },
+        backgroundColor = Black,
+        snackbarHost = { KeyLinkSnackBar(snackBarHostState = snackbarHostState) }
+    ) { innerPadding ->
+        KeyLinkNavHost(
+            appState = appState,
+            startDestination = "",
+            modifier = Modifier.padding(innerPadding),
+            onShowSnackbar = { message, action ->
+                snackbarHostState.showSnackbar(
+                    message = message,
+                    actionLabel = action,
+                    duration = SnackbarDuration.Short
+                ) == SnackbarResult.ActionPerformed
+            }
+        )
+    }
+}
+
+@Composable
+fun KeyLinkBottomNavigationBar() {
+
+}

presentation/src/main/java/com/mashup/presentation/KeyLinkAppState.kt

@@ -0,0 +1,49 @@
+package com.mashup.presentation
+
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.Stable
+import androidx.compose.runtime.remember
+import androidx.navigation.NavDestination
+import androidx.navigation.NavHostController
+import androidx.navigation.compose.currentBackStackEntryAsState
+import androidx.navigation.compose.rememberNavController
+
+/**
+ * Ssam_D_Android
+ * @author jaesung
+ * @created 2023/07/04
+ */
+
+@Composable
+fun rememberKeyLinkAppState(
+    navController: NavHostController = rememberNavController()
+): KeyLinkAppState {
+    return remember(navController) {
+        KeyLinkAppState(navController)
+    }
+}
+
+/**
+ * KeyLinkAppState에는 전반적인 어플리케이션 자체의 상태가 포함됩니다.
+ * 1. Navigation Destination
+ * 2. Multiple BackStack
+ * 3. BottomNavigation Visibility
+ * 4. NetworkMonitor(isOffline / isOnline)
+ * 5. ...
+ */
+@Stable
+class KeyLinkAppState(
+    val navController: NavHostController
+) {
+    val currentDestination: NavDestination?
+        @Composable get() = navController.currentBackStackEntryAsState().value?.destination
+
+
+    @Composable
+    fun isBottomBarVisible(): Boolean {
+        return true
+//        return when(currentDestination?.route) {
+//
+//        }
+    }
+}