feat: Working VoIP calling implementation (Flutter + Android)

Working video and audio calls, as well as android integration

pubspec.yaml

@@ -0,0 +1,25 @@
+name: liblinphone_flutter
+description: "A new Flutter plugin project."
+version: 0.0.1
+# homepage:
+
+environment:
+    sdk: ^3.9.0-333.2.beta
+    flutter: ">=3.3.0"
+
+dependencies:
+    flutter:
+        sdk: flutter
+    plugin_platform_interface: ^2.0.2
+
+dev_dependencies:
+    flutter_test:
+        sdk: flutter
+    flutter_lints: ^5.0.0
+
+flutter:
+    plugin:
+        platforms:
+            android:
+                package: xyz.nuark.liblinphone_flutter
+                pluginClass: LiblinphoneFlutterPlugin