added coveragerc

.coveragerc

@@ -0,0 +1,23 @@
+[run]
+branch = on
+source = input
+omit =
+    # ignore the tests itself
+    */test*.py
+    */tests/*.py
+
+    # ignore wsgi & asgi
+    */?sgi.py
+
+[report]
+include =
+    input/*
+exclude_lines =
+    pragma: no cover
+    raise NotImplementedError
+omit =
+    # they are excluded in run, so
+    # doesn't need to be reported
+    */test*.py
+    */tests/*.py
+    */?sgi.py