🔴 Title :Add dark mode theme in Virtual gardening planner

🔴 Enhancement Aim :user can choose their theme according to their choice
🔴 Changes : Use HTML,CSS,Javascript

Screenshots 📷

✅ Details to Include When Taking the Issue:
Name :Mansi
Participant Role (Specify the Open Source Program name, e.g., GSSOC, Hacktoberfest, etc.):

Happy Contributing! 🚀

Wishing you all the best on your open source journey. Enjoy! 😎