added getAllAppliers endpoint

[ManasDroid]

issue #29

[ManasDroid]

please review it and guide me

[volunux]

• You have to .gitignore all the .idea folders and all ide related folders and those not part of the project.
  How to add folder .gitignore
• ResponseEntity is not needed since @RestController already takes care of deserialization of class as JSON.
• ApplierController is missing necessary annotations, do check the existing controller classes.
• This @GetMapping("/api/v1/appliers") doesn't conform to project standard. Class should be annotated with

@RestController
@RequestMapping(value ="applier")

Then @GetMapping("/entries")

• Implementations of repository for retrieving all Appliers doesn't follow existing project standard even though it works, you would not be happy to read a code you do not understand by other members. Project members work must align and be uniform so that it can be meaningful to all.