Add example showing plotting brain regions in a single hemisphere (#383)

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

examples/regions_single_hemisphere.py

@@ -0,0 +1,21 @@
+"""
+Example to visualise brain regions in a single hemisphere
+"""
+
+from pathlib import Path
+
+from myterial import orange
+from rich import print
+
+from brainrender import Scene
+
+print(f"[{orange}]Running example: {Path(__file__).name}")
+
+# Create a brainrender scene
+scene = Scene(title="Left hemisphere", atlas_name="allen_mouse_25um")
+
+# Add brain regions
+scene.add_brain_region("CP", "VISp", hemisphere="left")
+
+# Render!
+scene.render()