Added share app functionality(issue #336) and created settings section(issue #340)

[jaivsh]

Description

For #336,

I've added the share application functionality, using which the use would be able to share the application to various platforms, including the social media applications, mail services, copying, and so on. This is done using the regular share intent.

For #340,

I've implemented the settings section in the application, which can be accessed from the bottom navigation menu. Apart from that, I've also added the basic settings features in the settings section.

Fixes #336 Fixes #340

Have you read the Contributing Guidelines on Pull Requests?

• [x] Yes
• [ ] No

Type of change

• [x] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [x] Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• [x] My code follows the style guidelines(Clean Code) of this project
• [x] I have performed a self-review of my own code
• [x] My changes generate no new warnings
• [x] I have added tests/screenshots(if any) that prove my fix is effective or that my feature works.

[jaivsh]

@avinashkranjan I've completed the implementation for the two projects issues: #336 and #340. Please review this PR. Thank you! @avinashkranjan