added eye icon

[ayushseth07]

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What does this implement/fix? Explain your changes.

Does this close any currently open issues?

fixed #324

How did you test your changes?

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[siv2r]

@ayushseth07 can you reverse the role of the eye icon? For example,

• eye icon present: password is shown when typed
• eye icon strikeout: password is hidden when typed