Ignore fvm files git

Author: dhiyaaulauliyaa

.gitignore

@@ -16,4 +16,5 @@ example/android/app/.classpath
 example/android/app/.project
 example/android/app/.settings/org.eclipse.buildship.core.prefs
 example/macos/Flutter/ephemeral/
-coverage/
+coverage/
+.fvm/