added default date tie in schema

Author: Vishwas1

src/credential/schemas/credntial.schema.ts

@@ -5,7 +5,9 @@ import { IsVcId } from 'src/utils/customDecorator/vc.decorator';
 
 export type CredentialModel = Credential & Document;
 
-@Schema()
+@Schema({
+  timestamps: true,
+})
 export class Credential {
   @IsString()
   @Prop({ required: true })

src/did/schemas/did.schema.ts

@@ -13,7 +13,9 @@ export enum RegistrationStatus {
   COMPLETED = 'COMPLETED',
   UNREGISTRED = 'UNREGISTRED',
 }
-@Schema()
+@Schema({
+  timestamps: true,
+})
 export class Did {
   @ApiHideProperty()
   @IsOptional()