add algo interfaces

Search/Search.py

@@ -0,0 +1,36 @@
+class State(object):
+    def __init__(self):
+        raise NotImplementedError
+
+    def __eq__(self, other):
+        raise NotImplementedError
+
+    def __hash__(self):
+        raise NotImplementedError
+
+    def __str__(self):
+        return ""
+
+
+class Problem(object):
+    def __init__(self, initial: State = None, goal: State = None):
+        self.goal = goal
+        self.initial = initial
+
+    def actions(self, state: State):
+        raise NotImplementedError
+
+    def result(self, state: State, action) -> State:
+        raise NotImplementedError
+
+    def goal_test(self, state: State):
+        return state == self.goal
+
+    def cost(self, state: State, action):
+        return 1
+
+    def heuristic(self, state: State, action):
+        return 0
+
+    def __str__(self):
+        return f"{type(self).__name__},{self.initial},{self.goal}"