chore: import upstream snapshot with attribution

Algorithm.Python/UserDefinedUniverseAlgorithm.py

@@ -0,0 +1,45 @@
+# QUANTCONNECT.COM - Democratizing Finance, Empowering Individuals.
+# Lean Algorithmic Trading Engine v2.0. Copyright 2014 QuantConnect Corporation.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+from AlgorithmImports import *
+
+### <summary>
+### This algorithm shows how you can handle universe selection in anyway you like,
+### at any time you like. This algorithm has a list of 10 stocks that it rotates
+### through every hour.
+### </summary>
+### <meta name="tag" content="using data" />
+### <meta name="tag" content="universes" />
+### <meta name="tag" content="custom universes" />
+class UserDefinedUniverseAlgorithm(QCAlgorithm):
+
+	def initialize(self) -> None:
+		self.set_cash(100000)
+		self.set_start_date(2015, 1, 1)
+		self.set_end_date(2015, 12, 1)
+		self._symbols = ["SPY", "GOOG", "IBM", "AAPL", "MSFT", "CSCO", "ADBE", "WMT"]
+
+		self.universe_settings.resolution = Resolution.HOUR
+		self.add_universe('my_universe_name', Resolution.HOUR, self.selection)
+
+	def selection(self, time: datetime) -> list[str]:
+		index = time.hour % len(self._symbols)
+		return [self._symbols[index]]
+
+	def on_securities_changed(self, changes: SecurityChanges) -> None:
+		for removed in changes.removed_securities:
+			if removed.invested:
+				self.liquidate(removed.symbol)
+
+		for added in changes.added_securities:
+			self.set_holdings(added.symbol, 1/len(changes.added_securities))