feat: add popup for successful login and register

[ANKeshri]

Title and Issue number

Title :add popup for successful login and register

Issue No. :#1109

Code Stack : html css and js

Close #1109

Description

add a messge successful login and succeessful register in login page

Video/Screenshots (mandatory)

Recording.2024-07-21.005713.mp4

Type of PR

• Feature enhancement

Checklist:

• I have performed a self-review of my code.
• I have commented my code, particularly in hard-to-understand areas.
• I have tested the changes thoroughly before submitting this pull request.
• I have provided relevant issue numbers, screenshots, and videos after making the changes.
• I have gone through the contributing.md file before contributing

Additional context:

##Are you contributing under any Open-source programme?

• I am contributing under GSSOC'24
• I am contributing under VSOC'24

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[ANKeshri]

@apu52 please review once and merge my pr

[apu52]

@ANKeshri GOOD WORK