Autodiscover components in components.py inside an app (#24)

Co-authored-by: @danjac

django_components/app_settings.py

@@ -0,0 +1,21 @@
+import sys
+
+from django.conf import settings
+
+
+class AppSettings:
+    def __init__(self):
+        self.settings = getattr(settings, "COMPONENTS", {})
+
+    @property
+    def AUTODISCOVER(self):
+        return self.settings.setdefault("autodiscover", True)
+
+    @property
+    def LIBRARIES(self):
+        return self.settings.setdefault("libraries", [])
+
+
+app_settings = AppSettings()
+app_settings.__name__ = __name__
+sys.modules[__name__] = app_settings