feat add questions module and admin routes

src/modules/questions/dtos/numeric-metadata.dto.ts

@@ -0,0 +1,13 @@
+import { IsNumber, IsOptional } from 'class-validator';
+
+export class NumericMetadataDTO {
+  @IsNumber()
+  min!: number;
+
+  @IsNumber()
+  max!: number;
+
+  @IsNumber()
+  @IsOptional()
+  step?: number;
+}