[tests,dependencies] install and configure coverage reports

The reports will be printed on the terminal and written in xml.

A new just recipe is added as well: `just cov`

closes: #9

pyproject.toml

@@ -24,6 +24,25 @@ addopts = [
   "--capture=sys",
 ]
 
+[tool.coverage]
+branch = true
+
+[tool.coverage.report]
+skip_covered = true
+skip_empty = true
+show_missing = true
+
+[tool.coverage.run]
+omit = [
+  "*/migrations/*",
+  "VERSION.py",
+  "manage.py",
+  "config/[aw]sgi.py",
+]
+
+[tool.coverage.xml]
+output = "reports/coverage/coverage.xml"
+
 [build-system]
 requires = ["pdm-backend"]
 build-backend = "pdm.backend"