Added Flight Fare Search API

[mohammedfarish]

• [x] My submission is formatted according to the guidelines in the contributing guide
• [x] My addition is ordered alphabetically
• [x] My submission has a useful description
• [x] The description does not have more than 100 characters
• [x] The description does not end with punctuation
• [x] Each table column is padded with one space on either side
• [x] I have searched the repository for any relevant issues or pull requests
• [x] Any category I am creating has the minimum requirement of 3 items
• [x] All changes have been squashed into a single commit

[marcelscruz]

@mohammedfarish could you please amend this PR to not include all the empty line changes? You'll probably need Pretter on your editor, so it keeps the formatting as it is and only the resource you added is included in the diff.

[mohammedfarish]

@marcelscruz thanks for pointing it out and I have fixed the formatting issue and also added an ignore line in .gitignore.

[marcelscruz]

Thank you!