Update README.md

Add Buildkite badge

README.md

@@ -16,6 +16,12 @@
             <a href="https://github.com/QuantumSavory/QuantumSavory.jl/actions?query=workflow%3ACI+branch%3Amaster"><img src="https://img.shields.io/github/actions/workflow/status/QuantumSavory/QuantumSavory.jl/ci.yml?branch=master" alt="GitHub Workflow Status"></a>
         </td>
     </tr><tr></tr>
+    <tr>
+        <td>Buildkite</td>
+        <td>
+            <a href="https://buildkite.com/quantumsavory/ci-plot-and-doctests"><img src="https://badge.buildkite.com/2713c9978db76235fbe98094b7cad9a05f04671fd442739c47.svg" alt="Buildkite Workflow Status"></a>
+        </td>
+    </tr><tr></tr>
     <tr>
         <td>Code coverage</td>
         <td>
@@ -29,4 +35,4 @@
             <a href="https://github.com/JuliaTesting/Aqua.jl"><img src="https://raw.githubusercontent.com/JuliaTesting/Aqua.jl/master/badge.svg" alt="Aqua QA"></a>
         </td>
     </tr>
-</table>
+</table>