[fix] Validations for weather search

[vatsalsinghkv]

Fixes #76

• Installed react toasts (for alerting).
• Fixed so empty string cannot be searched for weather
• Fixed so empty string cannot be searched for countries

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[HridoyHazard]

@vatsalsinghkv resolve the conflict plz

[vatsalsinghkv]

@HridoyHazard Fixed