feat: Rename CI/CD pipeline and add test badge to README

Author: ceelsoin

.github/workflows/cicd.yml

@@ -1,4 +1,4 @@
-name: CI/CD Pipeline
+name: Tests and Build
 
 on:
   push:

README.md

@@ -1,6 +1,8 @@
 [conteúdo antigo ou vazio]
 # BrasilCEP Webservice
 
+[![Tests](https://github.com/brasilcep/brasilcep-webservice/actions/workflows/cicd.yml/badge.svg)](https://github.com/brasilcep/brasilcep-webservice/actions/workflows/cicd.yml)
+
 API REST para consulta de CEPs brasileiros, baseada na base oficial dos Correios (DNE). Projeto open source, rápido, eficiente e fácil de usar.
 
 ## Sumário