[Feature] add Candidate interface

Author: greatSumini

src/interfaces/ICandidate.ts

@@ -0,0 +1,9 @@
+export interface ICandidate {
+  _id: number;
+  name: string;
+  voteCount: number;
+}
+
+export interface ICandidateInputDTO {
+  name: string;
+}

src/interfaces/index.ts

@@ -0,0 +1,2 @@
+export * from './ICandidate';
+export * from './IUser';