cleanup: rename action and add badge to readme

Author: natecraddock

.github/workflows/makefile.yml renamed to .github/workflows/tests.yml

@@ -1,4 +1,4 @@
-name: Tests
+name: tests
 
 on:
   push:
@@ -13,11 +13,11 @@ jobs:
     steps:
     - name: Clone Ziglua
       uses: actions/checkout@v3
-    
+
     - name: Setup Zig
       uses: goto-bus-stop/setup-zig@v1
       with:
         version: master
-      
+
     - name: Run tests
       run: make test

readme.md

@@ -1,5 +1,7 @@
 # Ziglua
 
+[![shield showing current tests status](https://github.com/natecraddock/ziglua/actions/workflows/tests.yml/badge.svg)](https://github.com/natecraddock/ziglua/actions/workflows/tests.yml)
+
 A Zig library that provides a complete and lightweight wrapper around the [Lua C API](https://www.lua.org/manual/5.4/manual.html#4). Ziglua currently supports the latest releases of Lua 5.1, 5.2, 5.3, and 5.4.
 
 The Ziglua library offers two use cases: