Added Community Guidelines

[dalvishruti14]

Popup window to display community guidelines is added. #28

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[karishmarajput]

Hey Shruti, please do the following changes

• Make the pop up (Modal) fix position in the center of page.
• Close button to be at the right corner of modal.
• Try to add small animation like when hover on close button colour changes.
• For mobile view please add some margin for modal.

[Savio629]

@dalvishruti14 do update the pr.