Initial commit of HermesControl Android app

app/src/main/java/com/m57/hermescontrol/NavigationController.kt

@@ -0,0 +1,26 @@
+package com.m57.hermescontrol
+
+import androidx.navigation3.runtime.NavBackStack
+import androidx.navigation3.runtime.NavKey
+
+object NavigationController {
+    var backStack: NavBackStack<NavKey>? = null
+
+    fun navigateTo(key: NavKey) {
+        val stack = backStack ?: return
+        if (stack.lastOrNull() == key) return
+
+        if (key == ChatScreen || key == SkillsScreen || key == CronJobsScreen) {
+            stack.clear()
+        }
+        stack.add(key)
+    }
+
+    fun add(key: NavKey) {
+        backStack?.add(key)
+    }
+
+    fun goBack() {
+        backStack?.removeLastOrNull()
+    }
+}