added pi zero backend for wrapping gpsd

pi/backend/pyproject.toml

@@ -0,0 +1,20 @@
+[project]
+name = "smartserow-backend"
+version = "0.1.0"
+description = "GPS service for Smart Serow"
+requires-python = ">=3.11"
+dependencies = [
+    "flask>=3.0",
+    "gpsdclient>=1.3",
+]
+
+[project.optional-dependencies]
+dev = [
+    "ruff",
+]
+
+[project.scripts]
+smartserow-backend = "main:main"
+
+[tool.ruff]
+line-length = 100