readme 添加徽标

.github/workflows/main.yml → .github/workflows/wa.yml

-name: main
+name: Wa
 on:
   pull_request:
   push:

README.md

 # 凹语言™
 
+[![Build Status](https://github.com/wa-lang/wa/actions/workflows/wa.yml/badge.svg)](https://github.com/wa-lang/wa/actions/workflows/wa.yml)
+[![Go Report Card](https://goreportcard.com/badge/github.com/wa-lang/wa)](https://goreportcard.com/report/github.com/wa-lang/wa)
+[![Coverage Status](https://codecov.io/gh/wa-lang/wa/branch/main/graph/badge.svg)](https://codecov.io/gh/wa-lang/wa)
+[![GitHub release](https://img.shields.io/github/v/tag/wa-lang/wa.svg?label=release)](https://github.com/wa-lang/wa/releases)
+
 凹语言™（凹读音“Wa”）是[柴树杉](https://github.com/chai2010)、[丁尔男](https://github.com/3dgen)和[史斌](https://github.com/benshi001)设计的实验性编程语言。
 
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