Add basic web and API layer classes for managing conditions

Each FHIR resource that we support has its own web and API later classes. For example, the FHIR allergy intolerance resource has the following classes,

RestfulAllergyIntoleranceResourceProvider
FHIRAllergyIntoleranceResource
AllergyIntoleranceService
AllergyIntoleranceServiceImpl

Using code written for allergy intolerance as an example, develop similar web and api layer endpoints for fhir condition resource as well. As this point, it is adequate to expose the API and web layer only, You do not need to write any business logic to model resources