User authentication using Linkedin

[YohanAvishke]

Purpose

The purpose of this PR is to fix #6

Goals

Users should be able to authenticate using Linkedin OAuth

Approach

1. Added the necessary dependencies(spring-boot-starter-oauth2-client, etc.)
2. Changed the application.properties to application.yml. Due to clean and less code duplication of yaml files.
3. Added Linkedin configurations to application.yml.
4. Added Web configurations to authenticate APIs from OAuth.

Screenshots

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Checklist

• This PR doesn't commit any keys, passwords, tokens, usernames, or other secrets.
• I have read and understood the development best practices guidelines ( http://bit.ly/sef-best-practices )
• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented on my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation

Related PRs

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Test environment

macOS 10.15, JDK 1.8

Learning

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