Added observables

src/cpl_reactive_extensions/subject.py

@@ -0,0 +1,17 @@
+from cpl_core.type import T
+from cpl_reactive_extensions.observable import Observable
+
+
+class Subject(Observable):
+    def __init__(self):
+        Observable.__init__(self)
+
+        self._value: T = None
+
+    @property
+    def value(self) -> T:
+        return self._value
+
+    def emit(self, value: T):
+        self._value = value
+        self._subscriptions()