Add a LinkedIn link to all six READMEs

A centered line under the badge row, above the language selector:
"Connect on LinkedIn!" in English, translated in the five others so no
reader hits an untranslated string.

Author: aaddrick

.github/readme/README.ja.md

@@ -9,6 +9,10 @@
   <a href="../workflows/plugin-load-check.yml"><img src="https://img.shields.io/github/actions/workflow/status/aaddrick/attention-control/plugin-load-check.yml?label=plugin%20loads&style=flat" alt="Plugin load check"></a>
 </p>
 
+<p align="center">
+  <a href="https://www.linkedin.com/in/aaddrick/">LinkedIn でつながりましょう！</a>
+</p>
+
 <p align="center">
   <a href="../../README.md">English</a> ·
   <a href="README.zh-CN.md">简体中文</a> ·

.github/readme/README.ko.md

@@ -9,6 +9,10 @@
   <a href="../workflows/plugin-load-check.yml"><img src="https://img.shields.io/github/actions/workflow/status/aaddrick/attention-control/plugin-load-check.yml?label=plugin%20loads&style=flat" alt="Plugin load check"></a>
 </p>
 
+<p align="center">
+  <a href="https://www.linkedin.com/in/aaddrick/">LinkedIn에서 연결해요!</a>
+</p>
+
 <p align="center">
   <a href="../../README.md">English</a> ·
   <a href="README.zh-CN.md">简体中文</a> ·

.github/readme/README.pt-BR.md

@@ -9,6 +9,10 @@
   <a href="../workflows/plugin-load-check.yml"><img src="https://img.shields.io/github/actions/workflow/status/aaddrick/attention-control/plugin-load-check.yml?label=plugin%20loads&style=flat" alt="Plugin load check"></a>
 </p>
 
+<p align="center">
+  <a href="https://www.linkedin.com/in/aaddrick/">Conecte-se no LinkedIn!</a>
+</p>
+
 <p align="center">
   <a href="../../README.md">English</a> ·
   <a href="README.zh-CN.md">简体中文</a> ·

.github/readme/README.vi.md

@@ -9,6 +9,10 @@
   <a href="../workflows/plugin-load-check.yml"><img src="https://img.shields.io/github/actions/workflow/status/aaddrick/attention-control/plugin-load-check.yml?label=plugin%20loads&style=flat" alt="Plugin load check"></a>
 </p>
 
+<p align="center">
+  <a href="https://www.linkedin.com/in/aaddrick/">Kết nối trên LinkedIn!</a>
+</p>
+
 <p align="center">
   <a href="../../README.md">English</a> ·
   <a href="README.zh-CN.md">简体中文</a> ·

.github/readme/README.zh-CN.md

@@ -9,6 +9,10 @@
   <a href="../workflows/plugin-load-check.yml"><img src="https://img.shields.io/github/actions/workflow/status/aaddrick/attention-control/plugin-load-check.yml?label=plugin%20loads&style=flat" alt="Plugin load check"></a>
 </p>
 
+<p align="center">
+  <a href="https://www.linkedin.com/in/aaddrick/">在 LinkedIn 上联系我！</a>
+</p>
+
 <p align="center">
   <a href="../../README.md">English</a> ·
   <strong>简体中文</strong> ·

README.md

@@ -9,6 +9,10 @@
   <a href=".github/workflows/plugin-load-check.yml"><img src="https://img.shields.io/github/actions/workflow/status/aaddrick/attention-control/plugin-load-check.yml?label=plugin%20loads&style=flat" alt="Plugin load check"></a>
 </p>
 
+<p align="center">
+  <a href="https://www.linkedin.com/in/aaddrick/">Connect on LinkedIn!</a>
+</p>
+
 <p align="center">
   <strong>English</strong> ·
   <a href=".github/readme/README.zh-CN.md">简体中文</a> ·