Merge pull request 'add class of a city' (#11) from city_class into master

Reviewed-on: #11
Reviewed-by: Mikołaj Gawor <mikgaw@st.amu.edu.pl>

city.py

@@ -0,0 +1,39 @@
+from typing import List, Tuple
+from garbageCan import GarbageCan
+
+class Node:
+    garbageCan: GarbageCan
+    id: int
+
+    def __init__(self, id: int, can: GarbageCan) -> None:
+        self.id = id
+        self.can = can
+
+class City:
+    nodes: List[Node]
+    streets: List[Tuple[int, int]]
+
+    def __init__(self) -> None:
+        self.nodes = []
+        self.streets = []
+
+    def add_node(self, node: Node) -> None:
+        self.nodes.append(node)
+    
+    def add_street(self, street: Tuple[int, int]) -> None:
+        firstFound: bool = False
+        secondFound: bool = False
+
+        for node in self.nodes:
+            if firstFound and secondFound:
+                break
+            if node.id == street.__getitem__(0):
+                firstFound = True
+                continue
+            if node.id == street.__getitem__(1):
+                secondFound = True
+        
+        if not firstFound or not secondFound:
+            return
+        
+        self.streets.append(street)