Added functions to fetch requirements from db.

Added functionality to create requirements on page

frontend/src/services/index.ts

@@ -1,3 +1,9 @@
 export { authService } from './authService'
 export { groupService } from './groupService'
 export type { Group } from './groupService'
+export { tagService } from './tagService'
+export type { Tag } from './tagService'
+export { priorityService } from './priorityService'
+export type { Priority } from './priorityService'
+export { requirementService } from './requirementService'
+export type { Requirement, RequirementCreateRequest, RequirementUpdateRequest } from './requirementService'