Add python examples, improve comments

Algorithm.Python/BasicTemplateLibrary.py

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+# 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 clr import AddReference
+AddReference("System")
+AddReference("QuantConnect.Algorithm")
+AddReference("QuantConnect.Common")
+
+from System import *
+from QuantConnect import *
+from QuantConnect.Algorithm import *
+
+### <summary>
+### Basic Template Library Class
+###
+### Library classes are snippets of code/classes you can reuse between projects. They are
+### added to projects on compile. This can be useful for reusing indicators, math functions,
+### risk modules etc. Make sure you import the class in your algorithm. You need
+### to name the file the module you'll be importing (not main.cs).
+### importing.
+### </summary>
+class BasicTemplateLibrary:
+
+    '''
+    To use this library place this at the top:
+    from BasicTemplateLibrary import BasicTemplateLibrary
+
+    Then instantiate the function:
+    x = BasicTemplateLibrary()
+    x.Add(1,2)
+    '''
+    def Add(self, a, b):
+        return a + b
+
+    def Subtract(self, a, b):
+        return a - b