Create accessibility-alt-text-bot.yml

### What

Adds the accessibility-alt-text-bot to this repo template so when others use this template to create a repo they alt-text-bot will already be setup

.github/workflows/accessibility-alt-text-bot.yml

@@ -0,0 +1,23 @@
+name: Accessibility-alt-text-bot
+on:
+  issues:
+    types: [opened, edited]
+  pull_request:
+    types: [opened, edited]
+  issue_comment:
+    types: [created, edited]
+  discussion:
+    types: [created, edited]
+  discussion_comment:
+    types: [created, edited]
+
+permissions:
+  issues: write
+  pull-requests: write
+  discussions: write
+
+jobs:
+  accessibility_alt_text_bot:
+    runs-on: ubuntu-latest
+    steps:
+       - uses: github/accessibility-alt-text-bot@v1.4.0