Update readme, add docs for standard tests

betterproto/tests/inputs/bool/test.py

@@ -1,8 +0,0 @@
-from betterproto.tests.output_betterproto.bool.bool import Test
-from betterproto.tests.util import read_relative
-
-
-def test_value():
-    message = Test().from_json(read_relative(__file__, 'bool.json'))
-    assert message.value
-

betterproto/tests/inputs/bool/test_bool.py

@@ -0,0 +1,6 @@
+from betterproto.tests.output_betterproto.bool.bool import Test
+
+
+def test_value():
+    message = Test()
+    assert not message.value, "Boolean is False by default"