chore: add fvm config and vscode sdk path

.fvmrc

@@ -0,0 +1,3 @@
+{
+  "flutter": "stable"
+}

.gitignore

@@ -43,3 +43,6 @@ app.*.map.json
 /android/app/debug
 /android/app/profile
 /android/app/release
+
+# FVM Version Cache
+.fvm/

.vscode/settings.json

@@ -0,0 +1,3 @@
+{
+  "dart.flutterSdkPath": ".fvm/versions/stable"
+}