create databaseerror classes, tbu

src/errors/DatabaseErrors.py

@@ -0,0 +1,10 @@
+
+class NoResultError(Exception):
+    def __init__(self,message):
+        self.message = f"The query: {message} returned no results"        
+        super().__init__(self.message)
+        
+class AppPresentError(Exception):
+    def __init__(self, message):
+        self.message = f"The app {message} is already present in the database"
+        super().__init__(self.message)