tunaui/build.gradle: Add dependency facebook shimmer;
tunaui/SelectPaymentMethodFragment.kt: Start and stop shimmer;
tunaui/TunaPaymentMethodShimmerWidget.kt: Shimmer widget that represents a payment method;
tunaui/select_payment_method_fragment.xml: Include layout of shimmer;
tunaui/select_payment_method_shimmer.xml: Layout with a list of shimmer widgets;
tunaui/widget_shimmer_payment_method.xml: Layout shimmer widget;
tunaui/attrs_widget_shimmer_payment_method.xml: Shimmer widget attributes;
tunaui/build.gradle: Add dependency facebook shimmer; tunaui/SelectPaymentMethodFragment.kt: Start and stop shimmer; tunaui/TunaPaymentMethodShimmerWidget.kt: Shimmer widget that represents a payment method; tunaui/select_payment_method_fragment.xml: Include layout of shimmer; tunaui/select_payment_method_shimmer.xml: Layout with a list of shimmer widgets; tunaui/widget_shimmer_payment_method.xml: Layout shimmer widget; tunaui/attrs_widget_shimmer_payment_method.xml: Shimmer widget attributes;
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