feat(server): wip tax rates service

packages/server/src/services/TaxRates/CommandTaxRatesValidators.ts

@@ -0,0 +1,16 @@
+import { ServiceError } from '@/exceptions';
+import TaxRate from '@/models/TaxRate';
+import { Service } from 'typedi';
+
+@Service()
+export class CommandTaxRatesValidators {
+  /**
+   * 
+   * @param {} taxRate 
+   */
+  public validateTaxRateExistance(taxRate: TaxRate | undefined | null) {
+    if (!taxRate) {
+      throw new ServiceError(ERRORS.TAX_RATE_NOT_FOUND);
+    }
+  }
+}