Added Note to concept-azure-machine-learning-architecture.md about .amlignore and .gitignore files for Snapshots. @ j-martens @Blackmist

Author: jackharter5

articles/machine-learning/service/concept-azure-machine-learning-architecture.md

@@ -156,6 +156,9 @@ For an example of viewing runs that are produced by training a model, see [Quick
 
 When you submit a run, Azure Machine Learning compresses the directory that contains the script as a zip file and sends it to the compute target. The zip file is then extracted, and the script is run there. Azure Machine Learning also stores the zip file as a snapshot as part of the run record. Anyone with access to the workspace can browse a run record and download the snapshot.
 
+> [!NOTE]
+> To prevent files from being included in the snapshot, make an ignore file (.gitignore or .amlignore) to prevent files from being included in the experiment snapshot that are not really a part of the source code. Place this file in the directory and add the files names to ignore in it. The .amlignore file uses the same [syntax and patterns as the .gitignore file](https://git-scm.com/docs/gitignore)git s. If both files exist, the .amlignore file takes precedence.
+
 ## Activity
 
 An activity represents a long running operation. The following operations are examples of activities: