added bottomNavigator to customerfrontend

[nehathakur27]

Fixes #13

Changes done

Modified app.js and wrapped it into a navigation container. Added a bottom tab navigator which consists of 4 screens, which are, Home, Profile, About and Option screens.

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Screenshots of the changes (If any) -

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✅️ By submitting this PR, I have verified the following

• [x] Worked on forked repo and starred the main repo
• [x] Checked to see if a similar PR has already been opened 🤔️
• [x] Reviewed the contributing guidelines 🔍️
• [ ] Sample preview link added (add the link(s) for all the pages changed/updated from the checks tab after checks complete)
• [ ] Tried Squashing the commits into one

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