Added Github workflow to run Black formatter.

.github/workflows/black.yml

@@ -0,0 +1,17 @@
+name: Black
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+
+jobs:
+  black:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: psf/black@stable
+        with:
+          options: "--check --verbose --diff"
+          src: "./interface-region-imaging-spectrograph"